Some experiments.

- Proper junk API calls for gmail and outlook, not just moving the item.
- Add ability to hide ai actions panel.

.github/copilot-instructions.md

@@ -100,6 +100,7 @@ _dialogService.InfoBarMessage(Translator.Info_MissingFolderTitle, message);
 - **NEVER** create IValueConverter classes or add them to Converters.xaml
 - **NEVER** use BoolToVisibilityConverter - WinUI 3 SDK automatically converts bool to Visibility
 - Direct binding: `Visibility="{x:Bind IsVisible, Mode=OneWay}"`
+- Register control events (for example `Loaded`, `Unloaded`, `SizeChanged`, `PointerEntered`) in XAML markup, not with `+=` in `.xaml.cs`.
 
 ### XamlHelpers for Complex Conversions
 - **ALWAYS** use XamlHelpers static methods instead of converters

.github/workflows/pr-winui-build.yml

@@ -8,6 +8,10 @@ on:
       - reopened
       - ready_for_review
 
+permissions:
+  contents: read
+  packages: read
+
 jobs:
   build-winui:
     name: Build project (${{ matrix.platform }})
@@ -33,6 +37,9 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 10.0.x
+          source-url: https://nuget.pkg.github.com/bkaankose/index.json
+        env:
+          NUGET_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Restore WinUI project dependencies
         run: dotnet restore Wino.Mail.WinUI/Wino.Mail.WinUI.csproj --configfile nuget.config -p:Platform=${{ matrix.platform }} -p:RuntimeIdentifier=${{ matrix.rid }}
@@ -54,6 +61,9 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 10.0.x
+          source-url: https://nuget.pkg.github.com/bkaankose/index.json
+        env:
+          NUGET_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Restore Core test projects
         shell: pwsh

AGENTS.md

@@ -1,6 +1,6 @@
-# CLAUDE.md
+# AGENTS.md
 
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+This file provides guidance to AI agent when working with code in this repository.
 
 ## Project Overview
 
@@ -12,14 +12,17 @@ Wino Mail is a native Windows mail client (Windows 10 1809+ / Windows 11) replac
 # Open solution
 # WinoMail.slnx is the main solution file (VS 2022+)
 
-# Build from command line
+# Build WinUI project (Debug x64)
-dotnet build WinoMail.slnx -c Debug
+dotnet restore Wino.Mail.WinUI/Wino.Mail.WinUI.csproj --configfile nuget.config -p:Platform=x64 -p:RuntimeIdentifier=win-x64 && dotnet build Wino.Mail.WinUI/Wino.Mail.WinUI.csproj -c Debug --no-restore /p:Platform=x64 /p:RuntimeIdentifier=win-x64 /p:GenerateAppxPackageOnBuild=false /p:AppxPackageSigningEnabled=false
 
-# Run tests
+# Build WinUI project with diagnostic XAML/compiler logging (use when plain build only shows "XamlCompiler.exe exited with code 1")
-dotnet test Wino.Core.Tests/Wino.Core.Tests.csproj
+dotnet build Wino.Mail.WinUI/Wino.Mail.WinUI.csproj -c Debug --no-restore /p:Platform=x64 /p:RuntimeIdentifier=win-x64 /p:GenerateAppxPackageOnBuild=false /p:AppxPackageSigningEnabled=false "/flp:logfile=winui-build.log;verbosity=diagnostic" /bl:winui-build.binlog
 
-# Build specific platform
+# Run tests (Debug x64)
-dotnet build WinoMail.slnx -c Debug /p:Platform=x64
+dotnet test Wino.Core.Tests/Wino.Core.Tests.csproj -c Debug /p:Platform=x64
+
+# Copilot CLI build command (Debug x64)
+dotnet restore Wino.Mail.WinUI/Wino.Mail.WinUI.csproj --configfile nuget.config -p:Platform=x64 -p:RuntimeIdentifier=win-x64 && dotnet build Wino.Mail.WinUI/Wino.Mail.WinUI.csproj -c Debug --no-restore /p:Platform=x64 /p:RuntimeIdentifier=win-x64 /p:GenerateAppxPackageOnBuild=false /p:AppxPackageSigningEnabled=false
 ```
 
 **Prerequisites:** Visual Studio 2022+ with ".NET desktop development" workload, .NET SDK 10+
@@ -28,6 +31,16 @@ dotnet build WinoMail.slnx -c Debug /p:Platform=x64
 
 **Platforms:** x86, x64, ARM64
 
+## Efficient Workflow
+
+- Start with targeted symbol or file search before reading full files
+- Prefer one focused task per thread; use a new thread for unrelated follow-up work
+- Keep verification narrow: build only the affected project, not the full solution, unless cross-project changes require it
+- After the first restore, prefer `--no-restore` builds unless package or project references changed
+- Summarize long build logs and inspect only the files named in diagnostics instead of loading large logs into context
+- When the prompt already names likely files, types, or symbols, start there instead of re-mapping the repository
+- If a WinUI build only reports `XamlCompiler.exe exited with code 1`, rerun with the diagnostic logging command above and inspect the terminal output plus `winui-build.log` for real `WMC`/`WMC1121`/binding diagnostics before guessing
+
 ## Architecture
 
 ### Solution Structure
@@ -90,13 +103,17 @@ private string searchQuery = string.Empty;
 - **NEVER** create IValueConverter classes
 - WinUI 3 auto-converts bool to Visibility: `Visibility="{x:Bind IsVisible, Mode=OneWay}"`
 - Use XamlHelpers for complex conversions: `{x:Bind helpers:XamlHelpers.ReverseBoolToVisibilityConverter(Prop)}`
+- `x:Bind` does not implicitly convert `double` to `GridLength`; when binding `RowDefinition.Height` or `ColumnDefinition.Width`, use a `XamlHelpers` method such as `DoubleToGridLength(...)`
+- For `ComboBox` controls in XAML, never use `DisplayMemberPath` or `SelectedValuePath`; use a typed `ItemTemplate` and bind `SelectedItem` explicitly, preferably with `x:Bind`
 
 ## Localization
 
-1. Add English strings ONLY to `Wino.Core.Domain/Translations/en_US/resources.json`
+1. Add English strings ONLY to Wino.Core.Domain/Translations/en_US/resources.json
 2. Build project - source generators create Translator properties
-3. Use `Translator.{PropertyName}` in code/XAML
+3. Use Translator.{PropertyName} in code/XAML
-4. **NEVER** edit other language files - Crowdin manages translations
+4. NEVER edit any resources.json file outside Wino.Core.Domain/Translations/en_US/resources.json
+5. Treat all non-en_US translation files as managed externally and leave them untouched, even when adding new localization keys
+6. In XAML, translation bindings must use `Mode=OneTime` because `Wino.Core.Domain/Translator.cs` does not implement `INotifyPropertyChanged`
 
 ## Storage
 
@@ -120,6 +137,7 @@ private string searchQuery = string.Empty;
 - Editing UWP project files instead of WinUI equivalents
 - Hardcoding strings instead of using Translator
 - Forgetting to unregister Messenger recipients (memory leaks)
+- Putting authentication validation, token refresh, account API calls, settings serialization/deserialization, or preference-application logic into ViewModels instead of the corresponding service
 
 ## Code Style
 
@@ -129,4 +147,15 @@ private string searchQuery = string.Empty;
 - String interpolation over string.Format
 - Wrap async operations in try-catch
 - Log errors via IWinoLogger
+- For dependency properties in WinUI code, always prefer `[GeneratedDependencyProperty]` from CommunityToolkit over manual `DependencyProperty.Register(...)` declarations.
+- When a `[RelayCommand]` needs enable/disable logic, prefer the command's `CanExecute` over binding `Button.IsEnabled` in XAML; use `[NotifyCanExecuteChangedFor]` on dependent properties and call `NotifyCanExecuteChanged()` explicitly when non-generated state affects the command.
 - In ViewModels, update all UI-bound properties/collections via `ExecuteUIThread(...)` (especially after awaited calls and any use of `ConfigureAwait(false)`).
+- ViewModels should only handle UI interaction/state and delegate business logic to services; account-management work belongs in `WinoAccountProfileService`, and preferences import/export/apply logic belongs in `PreferencesService`.
+- In `EventDetailsPageViewModel.LoadAttendeesAsync`, never mutate `CurrentEvent.Attendees` outside `ExecuteUIThread(...)`.
+- Never create pure C# controls or controls that heavily manipulate UI structure from `.cs` files. Define controls in XAML and keep UI composition in XAML.
+- Never add XAML-backed UI controls to `.xaml.cs`. If a view has XAML, all control declarations, flyouts, templates, and visual composition belong in the `.xaml` file; keep `.xaml.cs` limited to event handling and view glue.
+- Never subscribe to framework events like `Loaded`, `Unloaded`, or input events from constructors in `.xaml.cs` for XAML-backed controls and pages; wire them directly in XAML instead.
+- If you use `x:Load` in XAML, always give that `UIElement` an `x:Name`.
+
+
+

Directory.Packages.props

@@ -4,9 +4,9 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="ColorHashSharp" Version="1.1.0" />
-    <PackageVersion Include="CommunityToolkit.Common" Version="8.4.0" />
+    <PackageVersion Include="CommunityToolkit.Common" Version="8.4.2" />
-    <PackageVersion Include="CommunityToolkit.Diagnostics" Version="8.4.0" />
+    <PackageVersion Include="CommunityToolkit.Diagnostics" Version="8.4.2" />
-    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.1-build.4" />
+    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageVersion Include="CommunityToolkit.WinUI.Animations" Version="8.2.251219" />
     <PackageVersion Include="CommunityToolkit.WinUI.Controls.Segmented" Version="8.2.251219" />
     <PackageVersion Include="CommunityToolkit.WinUI.Controls.SettingsControls" Version="8.2.251219" />
@@ -15,63 +15,66 @@
     <PackageVersion Include="CommunityToolkit.WinUI.Controls.TokenizingTextBox" Version="8.2.251219" />
     <PackageVersion Include="CommunityToolkit.WinUI.Extensions" Version="8.2.251219" />
     <PackageVersion Include="CommunityToolkit.Labs.WinUI.Controls.MarkdownTextBlock" Version="0.1.250926-build.2293" />
-    <PackageVersion Include="Microsoft.Toolkit.Uwp.Notifications" Version="7.1.3" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Lottie" Version="8.2.250604" />
     <PackageVersion Include="CommunityToolkit.Labs.WinUI.DependencyPropertyGenerator" Version="0.1.250926-build.2293" />
     <PackageVersion Include="EmailValidation" Version="1.3.0" />
     <PackageVersion Include="gravatar-dotnet" Version="0.1.3" />
     <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
-    <PackageVersion Include="Ical.Net" Version="4.3.1" />
+    <PackageVersion Include="Ical.Net" Version="5.2.1" />
     <PackageVersion Include="IsExternalInit" Version="1.0.3" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="5.3.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.3.0" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.5" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.5" />
-    <PackageVersion Include="Microsoft.Graph" Version="5.99.0" />
+    <PackageVersion Include="Microsoft.Graph" Version="5.103.0" />
-    <PackageVersion Include="Microsoft.Graphics.Win2D" Version="1.3.2" />
+    <PackageVersion Include="Microsoft.Graphics.Win2D" Version="1.4.0" />
-    <PackageVersion Include="Microsoft.Identity.Client" Version="4.79.2" />
+    <PackageVersion Include="Microsoft.Identity.Client" Version="4.83.3" />
-    <PackageVersion Include="Microsoft.Identity.Client.Broker" Version="4.79.2" />
+    <PackageVersion Include="Microsoft.Identity.Client.Broker" Version="4.83.3" />
-    <PackageVersion Include="Microsoft.Identity.Client.Extensions.Msal" Version="4.79.2" />
+    <PackageVersion Include="Microsoft.Identity.Client.Extensions.Msal" Version="4.83.3" />
     <PackageVersion Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.14" />
-    <PackageVersion Include="Microsoft.Xaml.Behaviors.WinUI.Managed" Version="3.0.0" />
+    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools.MSIX" Version="1.7.260316102" />
-    <PackageVersion Include="MimeKit" Version="4.14.0" />
+    <PackageVersion Include="Microsoft.Xaml.Behaviors.WinUI.Managed" Version="3.0.1" />
+    <PackageVersion Include="Wino.Mail.Contracts" Version="1.0.18" />
+    <PackageVersion Include="MimeKit" Version="4.15.1" />
     <PackageVersion Include="morelinq" Version="4.4.0" />
     <PackageVersion Include="Nito.AsyncEx" Version="5.1.2" />
     <PackageVersion Include="Nito.AsyncEx.Tasks" Version="5.1.2" />
-    <PackageVersion Include="NodaTime" Version="3.2.3" />
+    <PackageVersion Include="NodaTime" Version="3.3.1" />
-    <PackageVersion Include="Sentry.Serilog" Version="6.0.0" />
+    <PackageVersion Include="Sentry.Serilog" Version="6.3.1" />
-    <PackageVersion Include="Serilog" Version="4.3.0" />
+    <PackageVersion Include="Serilog" Version="4.3.1" />
     <PackageVersion Include="Serilog.Exceptions" Version="8.4.0" />
     <PackageVersion Include="Serilog.Sinks.Debug" Version="3.0.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="7.0.0" />
     <PackageVersion Include="Serilog.Sinks.ApplicationInsights" Version="4.0.0" />
-    <PackageVersion Include="SkiaSharp" Version="3.119.1" />
+    <PackageVersion Include="SkiaSharp" Version="3.119.2" />
-    <PackageVersion Include="SkiaSharp.Views.WinUI" Version="3.119.1" />
+    <PackageVersion Include="SkiaSharp.Views.WinUI" Version="3.119.2" />
     <PackageVersion Include="sqlite-net-pcl" Version="1.10.196-beta" />
-    <PackageVersion Include="System.Drawing.Common" Version="10.0.1" />
+    <PackageVersion Include="System.Drawing.Common" Version="10.0.5" />
     <PackageVersion Include="System.Private.Uri" Version="4.3.2" />
     <PackageVersion Include="System.Text.Encoding.CodePages" Version="9.0.10" />
-    <PackageVersion Include="System.Text.Json" Version="10.0.1" />
+    <PackageVersion Include="System.Text.Json" Version="10.0.5" />
     <PackageVersion Include="H.NotifyIcon.Wpf" Version="2.3.0" />
     <PackageVersion Include="H.NotifyIcon.WinUI" Version="2.4.1" />
     <PackageVersion Include="CommunityToolkit.WinUI.Notifications" Version="7.1.2" />
     <PackageVersion Include="Google.Apis.Auth" Version="1.73.0" />
-    <PackageVersion Include="Google.Apis.Calendar.v3" Version="1.73.0.3993" />
+    <PackageVersion Include="Google.Apis.Calendar.v3" Version="1.73.0.4073" />
-    <PackageVersion Include="Google.Apis.Gmail.v1" Version="1.73.0.3987" />
+    <PackageVersion Include="Google.Apis.Drive.v3" Version="1.73.0.4098" />
+    <PackageVersion Include="Google.Apis.Gmail.v1" Version="1.73.0.4029" />
     <PackageVersion Include="Google.Apis.PeopleService.v1" Version="1.72.0.3973" />
     <PackageVersion Include="HtmlKit" Version="1.2.0" />
-    <PackageVersion Include="MailKit" Version="4.14.1" />
+    <PackageVersion Include="MailKit" Version="4.15.1" />
     <PackageVersion Include="TimePeriodLibrary.NET" Version="2.1.6" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
-    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.5" />
-    <PackageVersion Include="System.Text.Encodings.Web" Version="10.0.1" />
+    <PackageVersion Include="System.Text.Encodings.Web" Version="10.0.5" />
-    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.26100.7175" />
+    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.28000.1721" />
     <PackageVersion Include="Microsoft.WindowsAppSDK" Version="2.0.250930001-experimental1" />
     <PackageVersion Include="WinUIEx" Version="2.9.0" />
     <!-- Testing packages -->
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
-    <PackageVersion Include="xunit" Version="2.9.0" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
-    <PackageVersion Include="FluentAssertions" Version="7.0.0" />
+    <PackageVersion Include="FluentAssertions" Version="8.9.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
   </ItemGroup>
 </Project>

README.md

@@ -1,45 +1,54 @@
-
 <p align="center">
-  <a href="https://apps.microsoft.com/detail/Wino%20Mail/9NCRCVJC50WL?launch=true
+  <a href="https://apps.microsoft.com/detail/Wino%20Mail/9NCRCVJC50WL?launch=true&mode=full">
-	&mode=full">
+    <img src="https://www.winomail.app/images/v2/Logo.png" width="90" height="90" alt="Wino Mail logo">
-    <img src="https://www.winomail.app/images/wino_logo.png" width=90 height=90>
   </a>
 
   <h3 align="center">Wino Mail</h3>
 
   <p align="center">
-    Native mail client for Windows device families. 
+    Native mail and calendar client for Windows.
   </p>
 </p>
 
 <br>
 
-![pdark](https://user-images.githubusercontent.com/12009960/232114528-2d2c8e3c-dbe7-429a-94e0-6aecc73bdf70.png)
+![Wino Mail screenshot](https://user-images.githubusercontent.com/12009960/232114528-2d2c8e3c-dbe7-429a-94e0-6aecc73bdf70.png)
 
 ## Motivation
 
-I'm a big fan of Windows Mail & Calendars due to its simplicity. Personally, I find it more intuitive for daily use cases compared to Outlook desktop and the new WebView2 powered Outlook version. Seeing [Microsoft deprecating it](https://support.microsoft.com/en-us/office/outlook-for-windows-the-future-of-mail-calendar-and-people-on-windows-11-715fc27c-e0f4-4652-9174-47faa751b199#:~:text=The%20Mail%20and%20Calendar%20applications,will%20no%20longer%20be%20supported.) dragged me into starting to work on Wino a couple of years ago. Wino's main motivation is to bring all the existing functionality from Mail & Calendars over time without changing the user experience that millions have loved since the Windows 8 days in Mail & Calendars
+I'm a big fan of Windows Mail & Calendars due to its simplicity. Personally, I find it more intuitive for daily use cases compared to Outlook desktop and the new WebView2 powered Outlook version. Seeing [Microsoft deprecating it](https://support.microsoft.com/en-us/office/outlook-for-windows-the-future-of-mail-calendar-and-people-on-windows-11-715fc27c-e0f4-4652-9174-47faa751b199#:~:text=The%20Mail%20and%20Calendar%20applications,will%20no%20longer%20be%20supported.) dragged me into starting to work on Wino a couple of years ago. Wino's main motivation is to bring all the existing functionality from Mail & Calendars over time without changing the user experience that millions have loved since the Windows 8 days in Mail & Calendars.
+
+## vNext Release Highlights
+
+Wino vNext focuses on making Mail, Calendar, and Contacts feel like one cohesive native Windows experience while improving sync reliability and startup responsiveness.
+
+- 📅 **Calendar management:** Event compose/create flow, calendar-mail mapping, reminder snooze support, occurrence and detail-page improvements, and CalDAV correctness fixes.
+- 👥 **Contact management:** Improved contact workflows, account/settings integration, and contact data-model cleanup.
+- 🔄 **Synchronization reliability:** Refactored synchronizers, better state handling, 404 + 429 error handling, and duplicate-operation prevention.
+- ✉️ **Compose and drafts:** Refined editor/toolbar architecture, better rendering pipeline, Gmail draft support, and large Outlook attachment upload sessions.
+- ⚡ **Performance and quality:** Faster mail fetching with batched DB queries and caching, SQLite indexing/foreign key enforcement, and broader test + CI coverage.
+- 🎨 **WinUI polish:** Improved onboarding/startup, settings and dialogs refresh, notification routing fixes, and keyboard/navigation quality-of-life improvements.
 
 ## Features
 
-- API integration for Outlook and Gmail
+- 📨 Outlook and Gmail API integration
-- IMAP/SMTP support for custom mail servers
+- 🌐 IMAP/SMTP support for custom mail servers
-- Send, receive, mark as (read,important,spam etc), move mails.
+- 📅 Calendar support with event creation/compose and reminders
-- Linked/Merged Accounts
+- 👥 Contact management and people-centric account experience
-- Toast notifications with background sync.
+- ✅ Core mail actions: send, receive, read/unread, move, spam, and more
-- Instant startup performance
+- 🔗 Linked/Merged accounts
-- Offline use / search.
+- 🔔 Toast notifications with background sync
-- Modern and responsive UI
+- ⚡ Instant startup-oriented architecture
-- Lots of personalization options
+- 🔎 Offline-capable workflows and search improvements
-- Dark / Light mode for mail reader
+- 🎛️ Modern responsive WinUI interface with personalization options
+- 🌗 Dark/Light mode for mail reader and app surfaces
 
 ## Download
 
 Download latest version of Wino Mail from Microsoft Store for free.
 
-<a href="https://apps.microsoft.com/detail/Wino%20Mail/9NCRCVJC50WL?launch=true
+<a href="https://apps.microsoft.com/detail/Wino%20Mail/9NCRCVJC50WL?launch=true&mode=full">
-	&mode=full">
+	<img src="https://get.microsoft.com/images/en-us%20dark.svg" width="200" alt="Get Wino Mail from Microsoft Store"/>
-	<img src="https://get.microsoft.com/images/en-us%20dark.svg" width="200"/>
 </a>
 
 ## Beta Releases
@@ -48,7 +57,6 @@ Stable releases will always be distributed on Microsoft Store. However, beta rel
 
 These releases are distributed as side-loaded packages. To install them, download the **.msixbundle** file in GitHub releases and [follow the steps explained here.](https://learn.microsoft.com/en-us/windows/application-management/sideload-apps-in-windows)
 
-
 ## Contributing
 
 Check out the [contribution guidelines](/CONTRIBUTING.md) before diving into the source code or opening an issue. There are multiple ways to contribute and all of them are explained in detail there.
@@ -59,3 +67,4 @@ Your donations will motivate me more to work on Wino in my spare time and cover
 
 - You can [donate via Paypal by clicking here](https://www.paypal.com/donate/?hosted_button_id=LGPERGGXFMQ7U)
 - You can buy Unlimited Accounts add-on in the application. It's a one-time payment for lifetime, not a monthly recurring payment.
+

RELEASE_NOTES_vNext.md

@@ -0,0 +1,158 @@
+# Wino Mail vNext Improvements
+
+This document summarizes the major improvements on `feature/vNext` compared to `main`, based on the commit history between the current branch and the merge-base with `main`.
+
+## Wino Calendar
+
+Calendar has grown from an early implementation into a much more complete product area on this branch.
+
+### A full Wino Calendar experience
+
+- Added a dedicated Wino Calendar app entry, making calendar a first-class experience instead of a secondary add-on.
+- Built out the calendar rendering experience with multiple rounds of rendering improvements, updated calendar view styling, calendar buttons, and better event visuals.
+- Added event creation and full event compose flows, including follow-up improvements for attachments, attendees, recurrence summaries, RSVP actions, reminders, and event details.
+- Improved support for all-day events, better display dates, occurrence handling, and mail-to-calendar mapping so calendar actions connect more naturally with messages and invitations.
+
+### Local calendar support
+
+- Added local calendar operation coverage and supporting behavior for IMAP-backed/local calendar scenarios.
+- Prevented duplicate operations by ignoring local calendar apply-changes in the wrong paths.
+- Added busy-state support and metadata fetch flows so newly created accounts can initialize calendar data more reliably.
+
+### CalDAV sync
+
+- Introduced a dedicated CalDAV synchronizer and supporting service/client work.
+- Fixed CalDAV delta sync issues.
+- Fixed CalDAV timezone issues.
+- Added manual live CalDAV workflow tests to validate real-world sync behavior.
+
+This means local and self-hosted calendar scenarios are much better represented on this branch than on `main`.
+
+### API calendar sync for Outlook and Gmail
+
+- Expanded Outlook calendar sync behavior, including broader sync windows and fixes around date/time handling.
+- Improved Gmail drafting and mail/calendar integration so event-related actions work better across providers.
+- Added mail and calendar synchronizer state tracking to make sync progress and error handling more reliable.
+- Added auto calendar sync on account creation and broader auto-sync trigger and cancellation support.
+
+### Calendar polish and reliability
+
+- Fixed calendar crashes and null-handling issues in calendar view date range updates.
+- Fixed double initialization in calendar day views.
+- Improved reaction to calendar changes and calendar item update-source handling.
+- Added reminder snooze support across toast UI, services, and database storage.
+
+Overall, Wino Calendar is one of the biggest themes of this branch: richer UI, more complete event workflows, and real sync support across local, CalDAV, Outlook, and Gmail-backed scenarios.
+
+## Wino Accounts
+
+Wino Accounts was significantly expanded and polished on this branch.
+
+### Account flows and identity
+
+- Added sign in, sign out, and registration flows.
+- Redesigned login and registration dialogs.
+- Added privacy policy presentation during registration.
+- Added forgot password and email confirmation flows.
+- Pointed the app to the real API and improved profile caching.
+
+### Account management and settings
+
+- Added Wino account settings and a dedicated management page.
+- Added a special navigation item for Wino Accounts.
+- Added import functionality for Wino Accounts.
+- Added a preference to hide the title bar Wino account button.
+- Improved the top-shell account icon and signed-out identity visuals.
+
+### Purchases and add-ons
+
+- Added handling for Paddle purchases and add-ons.
+- Added purchase-success deep linking.
+- Added support for AI pack handling through the Microsoft Store.
+
+### User-facing polish
+
+- Redesigned the Wino Account flyout and menu with a more polished Fluent-style presentation.
+- Improved account cleanup behavior when an account is deleted.
+- Added account attention handling and better account details/settings behavior.
+
+Compared to `main`, this branch turns Wino Accounts into a much more complete platform feature rather than a minimal sign-in surface.
+
+## Improved Stability and Reliability
+
+A large part of this branch is about making the app more dependable in everyday use.
+
+### Synchronization stability
+
+- Refactored synchronizers to address long-standing reliability issues.
+- Improved thread mapping across synchronizers.
+- Added generic 404 handling for synchronizers.
+- Added specific Outlook 429 handling for rate-limit scenarios.
+- Improved Outlook authentication and Outlook sync reliability.
+- Improved Gmail synchronizer behavior.
+- Added explicit mail and calendar synchronizer state support.
+
+### Mail and data reliability
+
+- Optimized mail fetching with batched database queries and in-memory caching.
+- Added SQLite indexes and enabled foreign key enforcement.
+- Switched away from the old mail item queue approach and returned to a simpler initial sync strategy.
+- Improved local draft resend behavior and added grace-period handling for local drafts.
+- Added better handling for large Outlook attachments via upload sessions.
+- Fixed issues with sent/draft placement, loading mails with infinite scroll, selection cleanup, and deleted-object scenarios.
+
+### UI and lifecycle stability
+
+- Fixed mail rendering page disposal issues.
+- Fixed WebView2 runtime toast dispatching on the UI thread.
+- Fixed startup mode issues, single-instancing problems, and shell/navigation regressions.
+- Fixed multiple thread selection, container, flicker, and context-menu issues.
+- Fixed crashes and null-reference style issues in several calendar and shell flows.
+
+### Engineering quality
+
+- Added more tests across calendar, CalDAV, IMAP, view-model, sanitization, and account sync scenarios.
+- Added a GitHub Actions workflow to build WinUI and run Core tests on pull requests.
+- Resolved warnings and moved the WinUI project toward warnings-as-errors discipline.
+- Added AOT compatibility work and related cleanup across the app.
+
+The branch is not just adding features; it is also clearly reducing failure points throughout sync, rendering, navigation, and storage.
+
+## Contacts, Settings, and General UX
+
+This branch also improves the everyday product experience outside mail and calendar core flows.
+
+### Contacts
+
+- Added contacts management.
+- Improved contacts UI and related thread/image preview behavior.
+- Removed legacy SQLite base64 contact storage from `AccountContact`.
+- Added contact picture handling support and supporting contact service improvements.
+
+### Settings
+
+- Added a dedicated settings shell and refactored settings home/navigation.
+- Expanded settings UI and introduced new setting options.
+- Added calendar settings into the settings experience.
+- Improved account details/settings pages and storage settings navigation.
+- Refined settings visuals, shell integration, and menu behavior.
+
+### Onboarding and app experience
+
+- Added a new startup window and a more guided onboarding flow with wizard-like steps.
+- Added a "What's New" implementation for feature communication.
+- Improved dialogs, title bar behavior, shell content, navigation, and shell polish across multiple iterations.
+- Added live store update notifications.
+- Improved keyboard shortcuts and related dialogs.
+- Added tray icon support and better toast routing between mail and calendar app entries.
+
+## Summary
+
+Compared to `main`, `feature/vNext` delivers four major leaps:
+
+1. Wino Calendar becomes a substantially more complete feature set, including local calendar support, CalDAV sync, and stronger Outlook and Gmail calendar integration.
+2. Wino Accounts becomes a real product surface with better authentication flows, management, imports, purchases, and polish.
+3. The app is more stable thanks to synchronization refactors, storage improvements, test expansion, and many crash and lifecycle fixes.
+4. Contacts, settings, onboarding, and shell/navigation experience all feel more mature and more consistent.
+
+In short, this branch is a broad product maturation release rather than a narrow feature drop.

Wino.Calendar.ViewModels/CalendarAccountSettingsPageViewModel.cs

@@ -35,9 +35,6 @@ public partial class CalendarAccountSettingsPageViewModel : CalendarBaseViewMode
     [ObservableProperty]
     public partial bool IsSyncEnabled { get; set; }
 
-    [ObservableProperty]
-    public partial bool IsPrimaryCalendar { get; set; }
-
     public ObservableCollection<ShowAsOption> ShowAsOptions { get; } = new ObservableCollection<ShowAsOption>();
 
     [ObservableProperty]
@@ -82,7 +79,6 @@ public partial class CalendarAccountSettingsPageViewModel : CalendarBaseViewMode
         // Initialize properties from AccountCalendar
         AccountColorHex = AccountCalendar.BackgroundColorHex ?? "#0078D4";
         IsSyncEnabled = AccountCalendar.IsSynchronizationEnabled;
-        IsPrimaryCalendar = AccountCalendar.IsPrimary;
         SelectedDefaultShowAsOption = ShowAsOptions.FirstOrDefault(o => o.ShowAs == AccountCalendar.DefaultShowAs) ?? ShowAsOptions[2];
     }
 
@@ -91,6 +87,7 @@ public partial class CalendarAccountSettingsPageViewModel : CalendarBaseViewMode
         if (AccountCalendar != null && !string.IsNullOrEmpty(value))
         {
             AccountCalendar.BackgroundColorHex = value;
+            AccountCalendar.IsBackgroundColorUserOverridden = true;
             SaveChangesAsync();
         }
     }
@@ -104,15 +101,6 @@ public partial class CalendarAccountSettingsPageViewModel : CalendarBaseViewMode
         }
     }
 
-    partial void OnIsPrimaryCalendarChanged(bool value)
-    {
-        if (AccountCalendar != null)
-        {
-            AccountCalendar.IsPrimary = value;
-            SaveChangesAsync();
-        }
-    }
-
     partial void OnSelectedDefaultShowAsOptionChanged(ShowAsOption value)
     {
         if (AccountCalendar != null && value != null)

Wino.Calendar.ViewModels/CalendarAppShellViewModel.cs

@@ -1,6 +1,8 @@
-using System;
+using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Globalization;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
@@ -9,25 +11,25 @@ using CommunityToolkit.Mvvm.Messaging;
 using Serilog;
 using Wino.Calendar.ViewModels.Data;
 using Wino.Calendar.ViewModels.Interfaces;
+using Wino.Core.Domain;
 using Wino.Core.Domain.Collections;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Enums;
-using Wino.Core.Domain.Extensions;
 using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.MenuItems;
+using Wino.Core.Domain.Models;
 using Wino.Core.Domain.Models.Calendar;
 using Wino.Core.Domain.Models.Navigation;
 using Wino.Core.Domain.Models.Synchronization;
 using Wino.Core.ViewModels;
 using Wino.Messaging.Client.Calendar;
-using Wino.Messaging.Client.Navigation;
 using Wino.Messaging.Server;
 using Wino.Messaging.UI;
 
 namespace Wino.Calendar.ViewModels;
 
 public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
-    IRecipient<VisibleDateRangeChangedMessage>,
+    ICalendarShellClient,
-    IRecipient<CalendarEnableStatusChangedMessage>,
-    IRecipient<NavigateManageAccountsRequested>,
     IRecipient<CalendarDisplayTypeChangedMessage>,
     IRecipient<AccountRemovedMessage>
 {
@@ -35,27 +37,31 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
     public IStatePersistanceService StatePersistenceService { get; }
     public IAccountCalendarStateService AccountCalendarStateService { get; }
     public INavigationService NavigationService { get; }
+    public WinoApplicationMode Mode => WinoApplicationMode.Calendar;
+    public bool HandlesNavigationSelection => false;
+    public VisibleDateRange CurrentVisibleRange => _calendarPageViewModel.CurrentVisibleRange;
+    public string VisibleDateRangeText => _calendarPageViewModel.VisibleDateRangeText;
+    System.Collections.IEnumerable ICalendarShellClient.GroupedAccountCalendars => AccountCalendarStateService.GroupedAccountCalendars;
+    System.Collections.IEnumerable ICalendarShellClient.DateNavigationHeaderItems => DateNavigationHeaderItems;
+    object IShellClient.SelectedMenuItem
+    {
+        get => null;
+        set { }
+    }
+    System.Windows.Input.ICommand ICalendarShellClient.TodayClickedCommand => TodayClickedCommand;
+    System.Windows.Input.ICommand ICalendarShellClient.DateClickedCommand => DateClickedCommand;
+    System.Windows.Input.ICommand ICalendarShellClient.PreviousDateRangeCommand => PreviousDateRangeCommand;
+    System.Windows.Input.ICommand ICalendarShellClient.NextDateRangeCommand => NextDateRangeCommand;
+    System.Windows.Input.ICommand ICalendarShellClient.SyncCommand => SyncCommand;
+
+    public bool CanSynchronizeCalendars => !AccountCalendarStateService.IsAnySynchronizationInProgress;
+
+    public MenuItemCollection MenuItems { get; private set; }
+    public MenuItemCollection FooterItems { get; private set; }
 
     [ObservableProperty]
     private int _selectedMenuItemIndex = -1;
 
-    [ObservableProperty]
-    private bool isCalendarEnabled;
-
-
-
-    /// <summary>
-    /// Gets or sets the display date of the calendar.
-    /// </summary>
-    [ObservableProperty]
-    private DateTimeOffset _displayDate;
-
-    /// <summary>
-    /// Gets or sets the highlighted range in the CalendarView and displayed date range in FlipView.
-    /// </summary>
-    [ObservableProperty]
-    private DateRange highlightedDateRange;
-
     [ObservableProperty]
     private ObservableRangeCollection<string> dateNavigationHeaderItems = [];
 
@@ -64,28 +70,47 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
 
     public bool IsVerticalCalendar => StatePersistenceService.CalendarDisplayType == CalendarDisplayType.Month;
 
-    // For updating account calendars asynchronously.
+    [ObservableProperty]
-    private SemaphoreSlim _accountCalendarUpdateSemaphoreSlim = new(1);
+    private bool isStoreUpdateItemVisible;
 
-    public CalendarAppShellViewModel(IPreferencesService preferencesService,
+    private readonly SettingsItem _settingsItem = new();
-                             IStatePersistanceService statePersistanceService,
+    private readonly StoreUpdateMenuItem _storeUpdateMenuItem = new();
-                             IAccountService accountService,
+    private readonly SemaphoreSlim _accountCalendarUpdateSemaphoreSlim = new(1);
-                             ICalendarService calendarService,
+    private readonly CalendarPageViewModel _calendarPageViewModel;
-                             IAccountCalendarStateService accountCalendarStateService,
+    private readonly IMailDialogService _dialogService;
-                             INavigationService navigationService)
+    private readonly IStoreUpdateService _storeUpdateService;
+    private readonly IAccountService _accountService;
+    private readonly ICalendarService _calendarService;
+    private readonly IDateContextProvider _dateContextProvider;
+    private bool _runtimeSubscriptionsAttached;
+    private bool _hasRegisteredPersistentRecipients;
+    private DateTime? _navigationDate;
+
+    public CalendarAppShellViewModel(
+        IPreferencesService preferencesService,
+        IStatePersistanceService statePersistanceService,
+        IAccountService accountService,
+        ICalendarService calendarService,
+        IAccountCalendarStateService accountCalendarStateService,
+        INavigationService navigationService,
+        CalendarPageViewModel calendarPageViewModel,
+        IMailDialogService dialogService,
+        IStoreUpdateService storeUpdateService,
+        IDateContextProvider dateContextProvider)
     {
+        PreferencesService = preferencesService;
+        StatePersistenceService = statePersistanceService;
+        AccountCalendarStateService = accountCalendarStateService;
+        NavigationService = navigationService;
         _accountService = accountService;
         _calendarService = calendarService;
+        _calendarPageViewModel = calendarPageViewModel;
+        _dialogService = dialogService;
+        _storeUpdateService = storeUpdateService;
+        _dateContextProvider = dateContextProvider;
 
-        AccountCalendarStateService = accountCalendarStateService;
+        _calendarPageViewModel.PropertyChanged += CalendarPageViewModelPropertyChanged;
-        AccountCalendarStateService.AccountCalendarSelectionStateChanged += UpdateAccountCalendarRequested;
+        AccountCalendarStateService.PropertyChanged += AccountCalendarStateServicePropertyChanged;
-        AccountCalendarStateService.CollectiveAccountGroupSelectionStateChanged += AccountCalendarStateCollectivelyChanged;
-
-        NavigationService = navigationService;
-        PreferencesService = preferencesService;
-
-        StatePersistenceService = statePersistanceService;
-        StatePersistenceService.StatePropertyChanged += PrefefencesChanged;
     }
 
     protected override void OnDispatcherAssigned()
@@ -93,45 +118,161 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
         base.OnDispatcherAssigned();
 
         AccountCalendarStateService.Dispatcher = Dispatcher;
+        MenuItems = new MenuItemCollection(Dispatcher);
+        FooterItems = new MenuItemCollection(Dispatcher);
+        _ = RefreshFooterItemsAsync(false);
+    }
+
+    private void CalendarPageViewModelPropertyChanged(object sender, PropertyChangedEventArgs e)
+    {
+        if (e.PropertyName == nameof(CalendarPageViewModel.CurrentVisibleRange))
+        {
+            OnPropertyChanged(nameof(CurrentVisibleRange));
+        }
+
+        if (e.PropertyName == nameof(CalendarPageViewModel.CurrentVisibleRange) ||
+            e.PropertyName == nameof(CalendarPageViewModel.VisibleDateRangeText))
+        {
+            OnPropertyChanged(nameof(VisibleDateRangeText));
+            UpdateDateNavigationHeaderItems();
+        }
     }
 
     private void PrefefencesChanged(object sender, string e)
     {
-        if (e == nameof(StatePersistenceService.CalendarDisplayType))
+        if (e != nameof(StatePersistenceService.CalendarDisplayType))
+            return;
+
+        Messenger.Send(new CalendarDisplayTypeChangedMessage(StatePersistenceService.CalendarDisplayType));
+        OnPropertyChanged(nameof(IsVerticalCalendar));
+        UpdateDateNavigationHeaderItems();
+        NavigateCalendarDate(GetDisplayTypeSwitchDate());
+    }
+
+    private async void PreferencesServiceChanged(object sender, string e)
+    {
+        if (e == nameof(IPreferencesService.IsStoreUpdateNotificationsEnabled))
         {
-            Messenger.Send(new CalendarDisplayTypeChangedMessage(StatePersistenceService.CalendarDisplayType));
+            await RefreshFooterItemsAsync(false);
-
-            UpdateDateNavigationHeaderItems();
-
-            // Change the calendar.
-            DateClicked(new CalendarViewDayClickedEventArgs(GetDisplayTypeSwitchDate()));
         }
     }
 
     public override async void OnNavigatedTo(NavigationMode mode, object parameters)
     {
-        base.OnNavigatedTo(mode, parameters);
+        if (!_hasRegisteredPersistentRecipients)
-
-        // Account list may have changed while this shell was inactive.
-        if (mode == NavigationMode.Back)
         {
-            await InitializeAccountCalendarsAsync();
+            RegisterRecipients();
+            _hasRegisteredPersistentRecipients = true;
+        }
+
+        AttachRuntimeSubscriptions();
+
+        var activationContext = parameters as ShellModeActivationContext;
+        var shouldRunStartupFlows = activationContext?.IsInitialActivation ?? true;
+
+        PreferencesService.PreferenceChanged -= PreferencesServiceChanged;
+        PreferencesService.PreferenceChanged += PreferencesServiceChanged;
+
+        await RefreshFooterItemsAsync(mode == NavigationMode.New);
+        UpdateDateNavigationHeaderItems();
+        await InitializeAccountCalendarsAsync();
+        ValidateConfiguredNewEventCalendar();
+
+        if (activationContext?.Parameter is CalendarItemTarget calendarItemTarget)
+        {
+            NavigationService.Navigate(WinoPage.EventDetailsPage, calendarItemTarget);
             return;
         }
 
-        UpdateDateNavigationHeaderItems();
+        if (activationContext?.Parameter is CalendarPageNavigationArgs calendarPageNavigationArgs)
-
+        {
-        await InitializeAccountCalendarsAsync();
+            NavigationService.Navigate(WinoPage.CalendarPage, calendarPageNavigationArgs);
+            return;
+        }
 
         TodayClicked();
     }
 
+    public override void OnNavigatedFrom(NavigationMode mode, object parameters)
+    {
+        DetachRuntimeSubscriptions();
+        PreferencesService.PreferenceChanged -= PreferencesServiceChanged;
+        _ = ExecuteUIThread(() =>
+        {
+            DateNavigationHeaderItems.Clear();
+            AccountCalendarStateService.ClearGroupedAccountCalendars();
+            SelectedDateNavigationHeaderIndex = -1;
+        });
+        _calendarPageViewModel.CleanupForShellDeactivation();
+    }
+
+    public void PrepareForShellShutdown()
+    {
+        DetachRuntimeSubscriptions();
+        PreferencesService.PreferenceChanged -= PreferencesServiceChanged;
+
+        if (_hasRegisteredPersistentRecipients)
+        {
+            UnregisterRecipients();
+            _hasRegisteredPersistentRecipients = false;
+        }
+
+        DateNavigationHeaderItems.Clear();
+        SelectedDateNavigationHeaderIndex = -1;
+        SelectedMenuItemIndex = -1;
+        MenuItems?.Clear();
+        FooterItems?.Clear();
+        AccountCalendarStateService.ClearGroupedAccountCalendars();
+        _calendarPageViewModel.CleanupForShellDeactivation();
+    }
+
+    private void AccountCalendarStateServicePropertyChanged(object sender, PropertyChangedEventArgs e)
+    {
+        if (e.PropertyName != nameof(IAccountCalendarStateService.IsAnySynchronizationInProgress))
+            return;
+
+        OnPropertyChanged(nameof(CanSynchronizeCalendars));
+        SyncCommand.NotifyCanExecuteChanged();
+    }
+
+    private void AttachRuntimeSubscriptions()
+    {
+        if (_runtimeSubscriptionsAttached)
+            return;
+
+        AccountCalendarStateService.AccountCalendarSelectionStateChanged += UpdateAccountCalendarRequested;
+        AccountCalendarStateService.CollectiveAccountGroupSelectionStateChanged += AccountCalendarStateCollectivelyChanged;
+        StatePersistenceService.StatePropertyChanged += PrefefencesChanged;
+        _runtimeSubscriptionsAttached = true;
+    }
+
+    private void DetachRuntimeSubscriptions()
+    {
+        if (!_runtimeSubscriptionsAttached)
+            return;
+
+        AccountCalendarStateService.AccountCalendarSelectionStateChanged -= UpdateAccountCalendarRequested;
+        AccountCalendarStateService.CollectiveAccountGroupSelectionStateChanged -= AccountCalendarStateCollectivelyChanged;
+        StatePersistenceService.StatePropertyChanged -= PrefefencesChanged;
+        _runtimeSubscriptionsAttached = false;
+    }
+
+    private async Task RefreshFooterItemsAsync(bool showNotification)
+    {
+        await ExecuteUIThread(() =>
+        {
+            FooterItems.Clear();
+        });
+    }
+
+    private async Task StartStoreUpdateAsync()
+    {
+        await _storeUpdateService.StartUpdateAsync().ConfigureAwait(false);
+        await RefreshFooterItemsAsync(false).ConfigureAwait(false);
+    }
+
     private async void AccountCalendarStateCollectivelyChanged(object sender, GroupedAccountCalendarViewModel e)
     {
-        // When using three-state checkbox, multiple accounts will be selected/unselected at the same time.
-        // Reporting all these changes one by one to the UI is not efficient and may cause problems in the future.
-
-        // Update all calendar states at once.
         try
         {
             await _accountCalendarUpdateSemaphoreSlim.WaitAsync();
@@ -163,15 +304,7 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
         foreach (var account in accounts)
         {
             var accountCalendars = await _calendarService.GetAccountCalendarsAsync(account.Id).ConfigureAwait(false);
-            var calendarViewModels = new List<AccountCalendarViewModel>();
+            var calendarViewModels = accountCalendars.Select(calendar => new AccountCalendarViewModel(account, calendar)).ToList();
-
-            foreach (var calendar in accountCalendars)
-            {
-                var calendarViewModel = new AccountCalendarViewModel(account, calendar);
-
-                calendarViewModels.Add(calendarViewModel);
-            }
-
             var groupedAccountCalendarViewModel = new GroupedAccountCalendarViewModel(account, calendarViewModels);
 
             await Dispatcher.ExecuteOnUIThread(() =>
@@ -181,121 +314,154 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
         }
     }
 
+    private void NavigateCalendarDate(DateTime date)
+    {
+        _navigationDate = date.Date;
+        ForceNavigateCalendarDate();
+    }
+
     private void ForceNavigateCalendarDate()
     {
-        if (SelectedMenuItemIndex == -1)
+        var args = new CalendarPageNavigationArgs
         {
-            var args = new CalendarPageNavigationArgs()
+            NavigationDate = _navigationDate ?? DateTime.Now.Date
-            {
+        };
-                NavigationDate = _navigationDate ?? DateTime.Now.Date
-            };
 
-            // Already on calendar. Just navigate.
+        NavigationService.Navigate(WinoPage.CalendarPage, args);
-            NavigationService.Navigate(WinoPage.CalendarPage, args);
+        _navigationDate = null;
-
-            _navigationDate = null;
-        }
-        else
-        {
-            SelectedMenuItemIndex = -1;
-        }
     }
 
-    partial void OnSelectedMenuItemIndexChanged(int oldValue, int newValue)
+    [RelayCommand(CanExecute = nameof(CanSynchronizeCalendars))]
-    {
-        switch (newValue)
-        {
-            case -1:
-                ForceNavigateCalendarDate();
-                break;
-            case 0:
-                NavigationService.Navigate(WinoPage.ManageAccountsPage);
-                break;
-            case 1:
-                NavigationService.Navigate(WinoPage.SettingsPage);
-                break;
-            default:
-                break;
-        }
-    }
-
-    [RelayCommand]
     private async Task Sync()
     {
-        // Sync all calendars.
         var accounts = await _accountService.GetAccountsAsync().ConfigureAwait(false);
-
         foreach (var account in accounts)
         {
-            var t = new NewCalendarSynchronizationRequested(new CalendarSynchronizationOptions()
+            Messenger.Send(new NewCalendarSynchronizationRequested(new CalendarSynchronizationOptions
             {
                 AccountId = account.Id,
-                Type = CalendarSynchronizationType.CalendarEvents
+                Type = CalendarSynchronizationType.Strict
-            });
+            }));
-
-            Messenger.Send(t);
         }
     }
 
-    /// <summary>
-    /// When calendar type switches, we need to navigate to the most ideal date.
-    /// This method returns that date.
-    /// </summary>
     private DateTime GetDisplayTypeSwitchDate()
     {
+        var today = _dateContextProvider.GetToday();
         var settings = PreferencesService.GetCurrentCalendarSettings();
-        switch (StatePersistenceService.CalendarDisplayType)
+        var referenceRange = CurrentVisibleRange
-        {
+                             ?? CalendarRangeResolver.Resolve(new CalendarDisplayRequest(StatePersistenceService.CalendarDisplayType, today), settings, today);
-            case CalendarDisplayType.Day:
+        var targetRange = CalendarRangeResolver.ChangeDisplayType(referenceRange, StatePersistenceService.CalendarDisplayType, settings, today);
-                if (HighlightedDateRange.IsInRange(DateTime.Now)) return DateTime.Now.Date;
+        return targetRange.AnchorDate.ToDateTime(TimeOnly.MinValue);
-
-                return HighlightedDateRange.StartDate;
-            case CalendarDisplayType.Week:
-                if (HighlightedDateRange == null || HighlightedDateRange.IsInRange(DateTime.Now))
-                {
-                    return DateTime.Now.Date.GetWeekStartDateForDate(settings.FirstDayOfWeek);
-                }
-
-                return HighlightedDateRange.StartDate.GetWeekStartDateForDate(settings.FirstDayOfWeek);
-            case CalendarDisplayType.WorkWeek:
-                break;
-            case CalendarDisplayType.Month:
-                break;
-            default:
-                break;
-        }
-
-        return DateTime.Today.Date;
     }
 
-    private DateTime? _navigationDate;
-    private readonly IAccountService _accountService;
-    private readonly ICalendarService _calendarService;
-
-    #region Commands
-
     [RelayCommand]
     private void TodayClicked()
     {
-        _navigationDate = DateTime.Now.Date;
+        NavigateCalendarDate(_dateContextProvider.GetToday().ToDateTime(TimeOnly.MinValue));
-
-        ForceNavigateCalendarDate();
     }
 
     [RelayCommand]
-    public void ManageAccounts() => NavigationService.Navigate(WinoPage.AccountManagementPage);
+    private void PreviousDateRange()
+    {
+        NavigateRelativePeriod(-1);
+    }
 
+    [RelayCommand]
+    private void NextDateRange()
+    {
+        NavigateRelativePeriod(1);
+    }
 
+    private void NavigateRelativePeriod(int direction)
+    {
+        var today = _dateContextProvider.GetToday();
+        var settings = PreferencesService.GetCurrentCalendarSettings();
+        var referenceRange = CurrentVisibleRange
+                             ?? CalendarRangeResolver.Resolve(new CalendarDisplayRequest(StatePersistenceService.CalendarDisplayType, today), settings, today);
+        var targetRange = CalendarRangeResolver.Navigate(referenceRange, direction, settings, today);
+        NavigateCalendarDate(targetRange.AnchorDate.ToDateTime(TimeOnly.MinValue));
+    }
+
+    public async Task HandleNavigationItemInvokedAsync(IMenuItem menuItem)
+    {
+        switch (menuItem)
+        {
+            case NewMailMenuItem:
+                await NewEventAsync().ConfigureAwait(false);
+                break;
+            case SettingsItem:
+                NavigationService.Navigate(WinoPage.SettingsPage);
+                break;
+            case StoreUpdateMenuItem:
+                await StartStoreUpdateAsync().ConfigureAwait(false);
+                break;
+        }
+    }
+
+    [RelayCommand]
+    private async Task NewEventAsync()
+    {
+        var pickedCalendar = TryResolveConfiguredNewEventCalendar();
+
+        if (pickedCalendar == null)
+        {
+            var availableGroups = AccountCalendarStateService.GroupedAccountCalendars
+                .Where(group => group.AccountCalendars.Count > 0)
+                .Select(group => new CalendarPickerAccountGroup
+                {
+                    Account = group.Account,
+                    Calendars = group.AccountCalendars.Select(calendar => calendar.AccountCalendar).ToList()
+                })
+                .ToList();
+
+            if (availableGroups.Count == 0)
+            {
+                _dialogService.InfoBarMessage(
+                    Translator.CalendarEventCompose_NoCalendarsTitle,
+                    Translator.CalendarEventCompose_NoCalendarsMessage,
+                    InfoBarMessageType.Warning);
+                return;
+            }
+
+            var pickingResult = await _dialogService.ShowSingleCalendarPickerDialogAsync(availableGroups);
+            if (pickingResult.ShouldNavigateToCalendarSettings)
+            {
+                NavigationService.Navigate(WinoPage.CalendarPreferenceSettingsPage);
+                return;
+            }
+
+            pickedCalendar = pickingResult.PickedCalendar;
+        }
+
+        if (pickedCalendar == null)
+            return;
+
+        var (startDate, endDate) = GetDefaultComposeDateRange();
+
+        NavigationService.Navigate(WinoPage.CalendarEventComposePage, new CalendarEventComposeNavigationArgs
+        {
+            SelectedCalendarId = pickedCalendar.Id,
+            StartDate = startDate,
+            EndDate = endDate
+        });
+    }
+
+    public override async Task KeyboardShortcutHook(KeyboardShortcutTriggerDetails args)
+    {
+        if (args.Handled || args.Mode != WinoApplicationMode.Calendar)
+            return;
+
+        if (args.Action == KeyboardShortcutAction.NewEvent)
+        {
+            await NewEventAsync();
+            args.Handled = true;
+        }
+    }
 
     [RelayCommand]
     private void DateClicked(CalendarViewDayClickedEventArgs clickedDateArgs)
-    {
+        => NavigateCalendarDate(clickedDateArgs.ClickedDate);
-        _navigationDate = clickedDateArgs.ClickedDate;
-
-        ForceNavigateCalendarDate();
-    }
-
-    #endregion
 
     protected override void RegisterRecipients()
     {
@@ -303,9 +469,6 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
 
         UnregisterRecipients();
 
-        Messenger.Register<VisibleDateRangeChangedMessage>(this);
-        Messenger.Register<CalendarEnableStatusChangedMessage>(this);
-        Messenger.Register<NavigateManageAccountsRequested>(this);
         Messenger.Register<CalendarDisplayTypeChangedMessage>(this);
         Messenger.Register<AccountRemovedMessage>(this);
     }
@@ -314,99 +477,17 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
     {
         base.UnregisterRecipients();
 
-        Messenger.Unregister<VisibleDateRangeChangedMessage>(this);
-        Messenger.Unregister<CalendarEnableStatusChangedMessage>(this);
-        Messenger.Unregister<NavigateManageAccountsRequested>(this);
         Messenger.Unregister<CalendarDisplayTypeChangedMessage>(this);
         Messenger.Unregister<AccountRemovedMessage>(this);
     }
 
-    public void Receive(VisibleDateRangeChangedMessage message) => HighlightedDateRange = message.DateRange;
-
-    /// <summary>
-    /// Sets the header navigation items based on visible date range and calendar type.
-    /// </summary>
     private void UpdateDateNavigationHeaderItems()
     {
-        var settings = PreferencesService.GetCurrentCalendarSettings();
+        var headerText = VisibleDateRangeText;
-        var cultureInfo = settings.CultureInfo ?? CultureInfo.CurrentUICulture;
+        DateNavigationHeaderItems.ReplaceRange(string.IsNullOrWhiteSpace(headerText) ? [] : [headerText]);
-
-        var visibleRange = HighlightedDateRange ?? new DateRange(DateTime.Today, DateTime.Today.AddDays(1));
-        var headerText = GetHeaderText(visibleRange, cultureInfo);
-
-        DateNavigationHeaderItems.ReplaceRange([headerText]);
         SelectedDateNavigationHeaderIndex = DateNavigationHeaderItems.Count > 0 ? 0 : -1;
     }
 
-    private string GetHeaderText(DateRange visibleRange, CultureInfo cultureInfo)
-    {
-        var startDate = visibleRange.StartDate.Date;
-        var endDate = visibleRange.EndDate.Date > startDate ? visibleRange.EndDate.Date.AddDays(-1) : startDate;
-
-        switch (StatePersistenceService.CalendarDisplayType)
-        {
-            case CalendarDisplayType.Day:
-                return startDate.ToString("MMMM d, dddd", cultureInfo);
-            case CalendarDisplayType.Week:
-            case CalendarDisplayType.WorkWeek:
-                if (startDate.Month == endDate.Month && startDate.Year == endDate.Year)
-                {
-                    return $"{startDate.ToString("MMMM d", cultureInfo)} - {endDate.ToString("%d", cultureInfo)}";
-                }
-
-                return $"{startDate.ToString("MMMM d", cultureInfo)} - {endDate.ToString("MMMM d", cultureInfo)}";
-            case CalendarDisplayType.Month:
-                return GetDominantMonthHeaderText(startDate, endDate, cultureInfo);
-            default:
-                return startDate.ToString("d", cultureInfo);
-        }
-    }
-
-    private static string GetDominantMonthHeaderText(DateTime startDate, DateTime endDate, CultureInfo cultureInfo)
-    {
-        if (endDate < startDate)
-        {
-            endDate = startDate;
-        }
-
-        var monthDayCounts = new Dictionary<(int Year, int Month), int>();
-
-        for (var day = startDate; day <= endDate; day = day.AddDays(1))
-        {
-            var key = (day.Year, day.Month);
-
-            if (monthDayCounts.TryGetValue(key, out var count))
-            {
-                monthDayCounts[key] = count + 1;
-            }
-            else
-            {
-                monthDayCounts[key] = 1;
-            }
-        }
-
-        var dominantKey = (Year: startDate.Year, Month: startDate.Month);
-        var dominantCount = -1;
-
-        foreach (var pair in monthDayCounts)
-        {
-            if (pair.Value > dominantCount)
-            {
-                dominantCount = pair.Value;
-                dominantKey = pair.Key;
-            }
-        }
-
-        return new DateTime(dominantKey.Year, dominantKey.Month, 1).ToString("Y", cultureInfo);
-    }
-
-    partial void OnHighlightedDateRangeChanged(DateRange value) => UpdateDateNavigationHeaderItems();
-
-    public async void Receive(CalendarEnableStatusChangedMessage message)
-        => await ExecuteUIThread(() => IsCalendarEnabled = message.IsEnabled);
-
-    public void Receive(NavigateManageAccountsRequested message) => SelectedMenuItemIndex = 1;
-
     public void Receive(CalendarDisplayTypeChangedMessage message)
     {
         OnPropertyChanged(nameof(IsVerticalCalendar));
@@ -414,5 +495,69 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
     }
 
     public async void Receive(AccountRemovedMessage message)
-        => await InitializeAccountCalendarsAsync();
+    {
+        await InitializeAccountCalendarsAsync();
+        ValidateConfiguredNewEventCalendar();
+    }
+
+    private AccountCalendar TryResolveConfiguredNewEventCalendar()
+    {
+        ValidateConfiguredNewEventCalendar();
+
+        if (PreferencesService.NewEventButtonBehavior != NewEventButtonBehavior.AlwaysUseSpecificCalendar
+            || !PreferencesService.DefaultNewEventCalendarId.HasValue)
+        {
+            return null;
+        }
+
+        return AccountCalendarStateService.AllCalendars
+            .FirstOrDefault(calendar => calendar.Id == PreferencesService.DefaultNewEventCalendarId.Value)?
+            .AccountCalendar;
+    }
+
+    private void ValidateConfiguredNewEventCalendar()
+    {
+        if (PreferencesService.NewEventButtonBehavior != NewEventButtonBehavior.AlwaysUseSpecificCalendar
+            || !PreferencesService.DefaultNewEventCalendarId.HasValue)
+        {
+            return;
+        }
+
+        var exists = AccountCalendarStateService.AllCalendars
+            .Any(calendar => calendar.Id == PreferencesService.DefaultNewEventCalendarId.Value);
+
+        if (!exists)
+        {
+            PreferencesService.NewEventButtonBehavior = NewEventButtonBehavior.AskEachTime;
+            PreferencesService.DefaultNewEventCalendarId = null;
+        }
+    }
+
+    private static (DateTime StartDate, DateTime EndDate) GetDefaultComposeDateRange()
+    {
+        var localNow = DateTime.Now;
+        var roundedMinutes = localNow.Minute switch
+        {
+            < 30 => 30,
+            30 when localNow.Second == 0 && localNow.Millisecond == 0 => 30,
+            _ => 60
+        };
+
+        var startDate = new DateTime(localNow.Year, localNow.Month, localNow.Day, localNow.Hour, 0, 0);
+        startDate = roundedMinutes == 60 ? startDate.AddHours(1) : startDate.AddMinutes(roundedMinutes);
+
+        return (startDate, startDate.AddMinutes(30));
+    }
+
+    void IShellClient.Activate(ShellModeActivationContext activationContext)
+        => OnNavigatedTo(NavigationMode.New, activationContext);
+
+    void IShellClient.Deactivate()
+        => OnNavigatedFrom(NavigationMode.New, null!);
+
+    Task IShellClient.HandleNavigationItemInvokedAsync(IMenuItem menuItem)
+        => menuItem == null ? Task.CompletedTask : HandleNavigationItemInvokedAsync(menuItem);
+
+    Task IShellClient.HandleNavigationSelectionChangedAsync(IMenuItem menuItem)
+        => Task.CompletedTask;
 }

Wino.Calendar.ViewModels/CalendarEventComposePageViewModel.cs

@@ -0,0 +1,760 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using EmailValidation;
+using Wino.Calendar.ViewModels.Data;
+using Wino.Core.Domain;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Exceptions;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Calendar;
+using Wino.Core.Domain.Models.Navigation;
+using Wino.Core.Domain.Validation;
+using Wino.Core.ViewModels;
+
+namespace Wino.Calendar.ViewModels;
+
+public partial class CalendarEventComposePageViewModel : CalendarBaseViewModel
+{
+    private readonly IAccountService _accountService;
+    private readonly ICalendarService _calendarService;
+    private readonly INavigationService _navigationService;
+    private readonly IMailDialogService _dialogService;
+    private readonly IContactService _contactService;
+    private readonly IPreferencesService _preferencesService;
+    private readonly IUnderlyingThemeService _underlyingThemeService;
+    private readonly IWinoRequestDelegator _winoRequestDelegator;
+    private readonly CalendarEventComposeResultValidator _composeResultValidator = new();
+
+    public Func<Task<string>> GetHtmlNotesAsync { get; set; }
+
+    public ObservableCollection<AccountCalendarViewModel> AvailableCalendars { get; } = [];
+    public ObservableCollection<GroupedAccountCalendarViewModel> AvailableCalendarGroups { get; } = [];
+    public ObservableCollection<CalendarComposeAttendeeViewModel> Attendees { get; } = [];
+    public ObservableCollection<CalendarComposeAttachmentViewModel> Attachments { get; } = [];
+    public ObservableCollection<ShowAsOption> ShowAsOptions { get; } = [];
+    public ObservableCollection<ReminderOption> ReminderOptions { get; } = [];
+    public ObservableCollection<int> RecurrenceIntervalOptions { get; } = [];
+    public ObservableCollection<CalendarComposeFrequencyOption> RecurrenceFrequencyOptions { get; } = [];
+    public ObservableCollection<CalendarComposeWeekdayOption> WeekdayOptions { get; } = [];
+
+    [ObservableProperty]
+    public partial AccountCalendarViewModel SelectedCalendar { get; set; }
+
+    [ObservableProperty]
+    public partial string Title { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial string Location { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial bool IsAllDay { get; set; }
+
+    [ObservableProperty]
+    public partial DateTimeOffset StartDate { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan StartTime { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan EndTime { get; set; }
+
+    [ObservableProperty]
+    public partial DateTimeOffset AllDayEndDate { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsRecurring { get; set; }
+
+    [ObservableProperty]
+    public partial int SelectedRecurrenceInterval { get; set; } = 1;
+
+    [ObservableProperty]
+    public partial CalendarComposeFrequencyOption SelectedRecurrenceFrequencyOption { get; set; }
+
+    [ObservableProperty]
+    public partial DateTimeOffset? RecurrenceEndDate { get; set; }
+
+    [ObservableProperty]
+    public partial string RecurrenceSummary { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial ReminderOption SelectedReminderOption { get; set; }
+
+    [ObservableProperty]
+    public partial ShowAsOption SelectedShowAsOption { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsDarkWebviewRenderer { get; set; }
+
+    [ObservableProperty]
+    public partial CalendarEventComposeResult LastCreatedResult { get; set; }
+
+    public CalendarSettings CurrentSettings { get; }
+    public string TimePickerClockIdentifier => CurrentSettings.DayHeaderDisplayType == DayHeaderDisplayType.TwentyFourHour ? "24HourClock" : "12HourClock";
+    public bool HasAttachments => Attachments.Count > 0;
+    public bool IsSelectedCalendarCalDav => SelectedCalendar?.Account?.ProviderType == MailProviderType.IMAP4 &&
+                                            SelectedCalendar.Account.ServerInformation?.CalendarSupportMode == ImapCalendarSupportMode.CalDav;
+    public bool CanAddAttachments => !IsSelectedCalendarCalDav;
+    public string AttachmentsDisabledTooltipText => IsSelectedCalendarCalDav
+        ? Translator.CalendarEventCompose_AttachmentsNotSupportedForCalDav
+        : string.Empty;
+    public string SelectedCalendarDisplayText => SelectedCalendar?.Name ?? Translator.CalendarEventCompose_SelectCalendar;
+    public string SelectedCalendarAccountText => SelectedCalendar?.Account?.Address ?? string.Empty;
+    public bool IsDailyRecurrenceSelected => SelectedRecurrenceFrequencyOption?.Frequency == CalendarItemRecurrenceFrequency.Daily;
+
+    public CalendarEventComposePageViewModel(IAccountService accountService,
+                                             ICalendarService calendarService,
+                                             INavigationService navigationService,
+                                             IMailDialogService dialogService,
+                                             IContactService contactService,
+                                             IPreferencesService preferencesService,
+                                             IUnderlyingThemeService underlyingThemeService,
+                                             IWinoRequestDelegator winoRequestDelegator)
+    {
+        _accountService = accountService;
+        _calendarService = calendarService;
+        _navigationService = navigationService;
+        _dialogService = dialogService;
+        _contactService = contactService;
+        _preferencesService = preferencesService;
+        _underlyingThemeService = underlyingThemeService;
+        _winoRequestDelegator = winoRequestDelegator;
+
+        CurrentSettings = _preferencesService.GetCurrentCalendarSettings();
+        IsDarkWebviewRenderer = _underlyingThemeService.IsUnderlyingThemeDark();
+
+        Attachments.CollectionChanged += AttachmentsCollectionChanged;
+
+        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Free));
+        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Tentative));
+        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Busy));
+        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.OutOfOffice));
+        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.WorkingElsewhere));
+
+        foreach (var reminderMinutes in _calendarService.GetPredefinedReminderMinutes().OrderByDescending(x => x))
+        {
+            ReminderOptions.Add(new ReminderOption(reminderMinutes));
+        }
+
+        foreach (var interval in Enumerable.Range(1, 99))
+        {
+            RecurrenceIntervalOptions.Add(interval);
+        }
+
+        RecurrenceFrequencyOptions.Add(new CalendarComposeFrequencyOption(CalendarItemRecurrenceFrequency.Daily, Translator.CalendarEventCompose_FrequencyDay));
+        RecurrenceFrequencyOptions.Add(new CalendarComposeFrequencyOption(CalendarItemRecurrenceFrequency.Weekly, Translator.CalendarEventCompose_FrequencyWeek));
+        RecurrenceFrequencyOptions.Add(new CalendarComposeFrequencyOption(CalendarItemRecurrenceFrequency.Monthly, Translator.CalendarEventCompose_FrequencyMonth));
+        RecurrenceFrequencyOptions.Add(new CalendarComposeFrequencyOption(CalendarItemRecurrenceFrequency.Yearly, Translator.CalendarEventCompose_FrequencyYear));
+        SelectedRecurrenceFrequencyOption = RecurrenceFrequencyOptions.FirstOrDefault();
+
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Monday, "MO", Translator.CalendarEventCompose_Weekday_Monday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Tuesday, "TU", Translator.CalendarEventCompose_Weekday_Tuesday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Wednesday, "WE", Translator.CalendarEventCompose_Weekday_Wednesday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Thursday, "TH", Translator.CalendarEventCompose_Weekday_Thursday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Friday, "FR", Translator.CalendarEventCompose_Weekday_Friday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Saturday, "SA", Translator.CalendarEventCompose_Weekday_Saturday));
+        WeekdayOptions.Add(CreateWeekdayOption(DayOfWeek.Sunday, "SU", Translator.CalendarEventCompose_Weekday_Sunday));
+
+        SelectedReminderOption = GetDefaultReminderOption();
+        SelectedShowAsOption = ShowAsOptions.FirstOrDefault(option => option.ShowAs == CalendarItemShowAs.Busy);
+
+        var (defaultStart, defaultEnd) = GetDefaultComposeDateRange();
+        ApplyDateRange(defaultStart, defaultEnd, false);
+    }
+
+    public override async void OnNavigatedTo(NavigationMode mode, object parameters)
+    {
+        base.OnNavigatedTo(mode, parameters);
+
+        await LoadAvailableCalendarsAsync();
+
+        var args = parameters as CalendarEventComposeNavigationArgs;
+        ApplyNavigationArgs(args);
+        UpdateRecurrenceSummary();
+    }
+
+    partial void OnSelectedCalendarChanged(AccountCalendarViewModel value)
+    {
+        if (value == null)
+            return;
+
+        SelectedShowAsOption = ShowAsOptions.FirstOrDefault(option => option.ShowAs == value.DefaultShowAs)
+                               ?? ShowAsOptions.FirstOrDefault();
+
+        if (IsSelectedCalendarCalDav && Attachments.Count > 0)
+        {
+            Attachments.Clear();
+        }
+
+        OnPropertyChanged(nameof(IsSelectedCalendarCalDav));
+        OnPropertyChanged(nameof(CanAddAttachments));
+        OnPropertyChanged(nameof(AttachmentsDisabledTooltipText));
+        OnPropertyChanged(nameof(SelectedCalendarDisplayText));
+        OnPropertyChanged(nameof(SelectedCalendarAccountText));
+    }
+
+    partial void OnIsAllDayChanged(bool value)
+    {
+        if (value)
+        {
+            if (AllDayEndDate.Date <= StartDate.Date)
+            {
+                AllDayEndDate = StartDate.AddDays(1);
+            }
+        }
+
+        UpdateRecurrenceSummary();
+    }
+
+    partial void OnStartDateChanged(DateTimeOffset value)
+    {
+        if (IsAllDay && AllDayEndDate.Date <= value.Date)
+        {
+            AllDayEndDate = value.AddDays(1);
+        }
+
+        if (IsRecurring && WeekdayOptions.All(option => !option.IsSelected))
+        {
+            SelectSingleWeekday(value.DayOfWeek);
+        }
+
+        UpdateRecurrenceSummary();
+    }
+
+    partial void OnStartTimeChanged(TimeSpan value) => UpdateRecurrenceSummary();
+    partial void OnEndTimeChanged(TimeSpan value) => UpdateRecurrenceSummary();
+    partial void OnAllDayEndDateChanged(DateTimeOffset value) => UpdateRecurrenceSummary();
+    partial void OnIsRecurringChanged(bool value)
+    {
+        if (value && WeekdayOptions.All(option => !option.IsSelected))
+        {
+            SelectSingleWeekday(StartDate.DayOfWeek);
+        }
+
+        UpdateRecurrenceSummary();
+    }
+    partial void OnSelectedRecurrenceIntervalChanged(int value) => UpdateRecurrenceSummary();
+    partial void OnSelectedRecurrenceFrequencyOptionChanged(CalendarComposeFrequencyOption value)
+    {
+        OnPropertyChanged(nameof(IsDailyRecurrenceSelected));
+        UpdateRecurrenceSummary();
+    }
+    partial void OnRecurrenceEndDateChanged(DateTimeOffset? value) => UpdateRecurrenceSummary();
+
+    [RelayCommand]
+    private async Task AddAttachmentsAsync()
+    {
+        if (!CanAddAttachments)
+            return;
+
+        var pickedFiles = await _dialogService.PickFilesMetadataAsync("*");
+        if (pickedFiles.Count == 0)
+            return;
+
+        await ExecuteUIThread(() =>
+        {
+            foreach (var file in pickedFiles)
+            {
+                TryAddAttachment(file.FileName, file.FullFilePath, file.FileExtension, file.Size);
+            }
+        });
+    }
+
+    public bool TryAddAttachment(string filePath, long size)
+    {
+        if (string.IsNullOrWhiteSpace(filePath))
+            return false;
+
+        var fileName = Path.GetFileName(filePath);
+        var fileExtension = Path.GetExtension(filePath);
+        return TryAddAttachment(fileName, filePath, fileExtension, size);
+    }
+
+    [RelayCommand]
+    private void RemoveAttachment(CalendarComposeAttachmentViewModel attachment)
+    {
+        if (attachment == null)
+            return;
+
+        Attachments.Remove(attachment);
+    }
+
+    [RelayCommand]
+    private void ClearRecurrenceEndDate()
+    {
+        RecurrenceEndDate = null;
+    }
+
+    [RelayCommand]
+    private void Cancel()
+    {
+        _navigationService.GoBack();
+    }
+
+    [RelayCommand]
+    private async Task CreateAsync()
+    {
+        var uniqueAttendees = Attendees
+            .GroupBy(attendee => attendee.Email, StringComparer.OrdinalIgnoreCase)
+            .Select(group => group.First())
+            .ToList();
+
+        var createdResult = await BuildResultAsync(uniqueAttendees);
+
+        try
+        {
+            _composeResultValidator.Validate(createdResult);
+        }
+        catch (CalendarEventComposeValidationException ex)
+        {
+            ShowValidationMessage(ex.Message);
+            return;
+        }
+
+        LastCreatedResult = createdResult;
+
+        await _winoRequestDelegator.ExecuteAsync(new CalendarOperationPreparationRequest(
+            CalendarSynchronizerOperation.CreateEvent,
+            ComposeResult: createdResult));
+
+        NavigateBackToCalendar(createdResult.StartDate);
+    }
+
+    private void NavigateBackToCalendar(DateTime targetDate)
+    {
+        _navigationService.Navigate(
+            WinoPage.CalendarPage,
+            new CalendarPageNavigationArgs
+            {
+                NavigationDate = targetDate,
+                ForceReload = true
+            });
+    }
+
+    public async Task<List<AccountContact>> SearchContactsAsync(string queryText)
+    {
+        if (string.IsNullOrWhiteSpace(queryText) || queryText.Length < 2)
+            return [];
+
+        return await _contactService.GetAddressInformationAsync(queryText).ConfigureAwait(false);
+    }
+
+    public async Task<CalendarComposeAttendeeViewModel> GetAttendeeAsync(string tokenText)
+    {
+        if (!EmailValidator.Validate(tokenText))
+            return null;
+
+        var existing = Attendees.Any(attendee => attendee.Email.Equals(tokenText, StringComparison.OrdinalIgnoreCase));
+        if (existing)
+            return null;
+
+        var info = await _contactService.GetAddressInformationByAddressAsync(tokenText).ConfigureAwait(false);
+        if (info != null)
+        {
+            return CalendarComposeAttendeeViewModel.FromContact(info);
+        }
+
+        return new CalendarComposeAttendeeViewModel(string.Empty, tokenText);
+    }
+
+    public void AddAttendee(CalendarComposeAttendeeViewModel attendee)
+    {
+        if (Attendees.Any(existing => existing.Email.Equals(attendee.Email, StringComparison.OrdinalIgnoreCase)))
+            return;
+
+        Attendees.Add(attendee);
+    }
+
+    [RelayCommand]
+    private void RemoveAttendee(CalendarComposeAttendeeViewModel attendee)
+    {
+        if (attendee == null)
+            return;
+
+        Attendees.Remove(attendee);
+    }
+
+    public void NotifyAddressExists()
+    {
+        _dialogService.InfoBarMessage(
+            Translator.Info_ContactExistsTitle,
+            Translator.Info_ContactExistsMessage,
+            InfoBarMessageType.Warning);
+    }
+
+    public void NotifyInvalidEmail(string address)
+    {
+        _dialogService.InfoBarMessage(
+            Translator.Info_InvalidAddressTitle,
+            string.Format(Translator.Info_InvalidAddressMessage, address),
+            InfoBarMessageType.Warning);
+    }
+
+    private async Task LoadAvailableCalendarsAsync()
+    {
+        var accountCalendars = new List<AccountCalendarViewModel>();
+        var groupedCalendars = new List<GroupedAccountCalendarViewModel>();
+        var accounts = await _accountService.GetAccountsAsync().ConfigureAwait(false);
+
+        foreach (var account in accounts)
+        {
+            var calendars = await _calendarService.GetAccountCalendarsAsync(account.Id).ConfigureAwait(false);
+            var viewModels = calendars
+                .Select(calendar => new AccountCalendarViewModel(account, calendar))
+                .ToList();
+
+            accountCalendars.AddRange(viewModels);
+
+            if (viewModels.Count > 0)
+            {
+                groupedCalendars.Add(new GroupedAccountCalendarViewModel(account, viewModels));
+            }
+        }
+
+        await ExecuteUIThread(() =>
+        {
+            AvailableCalendars.Clear();
+            AvailableCalendarGroups.Clear();
+
+            foreach (var calendar in accountCalendars.OrderBy(calendar => calendar.Account.Name).ThenBy(calendar => calendar.Name))
+            {
+                AvailableCalendars.Add(calendar);
+            }
+
+            foreach (var group in groupedCalendars.OrderBy(group => group.Account.Name))
+            {
+                AvailableCalendarGroups.Add(group);
+            }
+        });
+    }
+
+    private void ApplyNavigationArgs(CalendarEventComposeNavigationArgs args)
+    {
+        var (defaultStart, defaultEnd) = GetDefaultComposeDateRange();
+        var startDate = args?.StartDate != default ? args!.StartDate : defaultStart;
+        var endDate = args?.EndDate != default ? args!.EndDate : defaultEnd;
+        var isAllDay = args?.IsAllDay ?? false;
+
+        Title = args?.Title ?? string.Empty;
+        Location = args?.Location ?? string.Empty;
+
+        ApplyDateRange(startDate, endDate, isAllDay);
+
+        SelectedCalendar = ResolveSelectedCalendar(args?.SelectedCalendarId);
+        if (SelectedCalendar != null)
+        {
+            SelectedShowAsOption = ShowAsOptions.FirstOrDefault(option => option.ShowAs == SelectedCalendar.DefaultShowAs)
+                                   ?? SelectedShowAsOption
+                                   ?? ShowAsOptions.FirstOrDefault();
+        }
+    }
+
+    private AccountCalendarViewModel ResolveSelectedCalendar(Guid? selectedCalendarId)
+    {
+        if (selectedCalendarId.HasValue)
+        {
+            var selectedCalendar = AvailableCalendars.FirstOrDefault(calendar => calendar.Id == selectedCalendarId.Value);
+            if (selectedCalendar != null)
+                return selectedCalendar;
+        }
+
+        return AvailableCalendars.FirstOrDefault(calendar => calendar.IsPrimary) ?? AvailableCalendars.FirstOrDefault();
+    }
+
+    private void ApplyDateRange(DateTime startDate, DateTime endDate, bool isAllDay)
+    {
+        IsAllDay = isAllDay;
+        StartDate = new DateTimeOffset(startDate.Date);
+        StartTime = startDate.TimeOfDay;
+        EndTime = endDate.TimeOfDay;
+        AllDayEndDate = new DateTimeOffset((isAllDay ? endDate.Date : startDate.Date.AddDays(1)));
+    }
+
+    private async Task<CalendarEventComposeResult> BuildResultAsync(List<CalendarComposeAttendeeViewModel> uniqueAttendees)
+    {
+        if (RecurrenceEndDate.HasValue && RecurrenceEndDate.Value.Date < StartDate.Date)
+        {
+            throw new CalendarEventComposeValidationException(Translator.CalendarEventCompose_ValidationInvalidRecurrenceEnd);
+        }
+
+        var htmlNotes = GetHtmlNotesAsync == null ? string.Empty : await GetHtmlNotesAsync();
+        var effectiveStart = GetEffectiveStartDateTime();
+        var effectiveEnd = GetEffectiveEndDateTime();
+
+        return new CalendarEventComposeResult
+        {
+            CalendarId = SelectedCalendar?.Id ?? Guid.Empty,
+            AccountId = SelectedCalendar?.Account.Id ?? Guid.Empty,
+            Title = Title.Trim(),
+            Location = Location?.Trim() ?? string.Empty,
+            HtmlNotes = htmlNotes,
+            StartDate = effectiveStart,
+            EndDate = effectiveEnd,
+            IsAllDay = IsAllDay,
+            TimeZoneId = TimeZoneInfo.Local.Id,
+            ShowAs = SelectedShowAsOption?.ShowAs ?? SelectedCalendar?.DefaultShowAs ?? CalendarItemShowAs.Busy,
+            SelectedReminders = BuildSelectedReminders(),
+            Attendees = BuildAttendees(uniqueAttendees),
+            Attachments = CanAddAttachments
+                ? Attachments.Select(attachment => attachment.ToDraftModel()).ToList()
+                : [],
+            Recurrence = BuildRecurrenceRule(),
+            RecurrenceSummary = RecurrenceSummary
+        };
+    }
+
+    private List<Reminder> BuildSelectedReminders()
+    {
+        if (SelectedReminderOption == null)
+            return [];
+
+        return
+        [
+            new Reminder
+            {
+                Id = Guid.NewGuid(),
+                CalendarItemId = Guid.Empty,
+                DurationInSeconds = SelectedReminderOption.Minutes * 60L,
+                ReminderType = CalendarItemReminderType.Popup
+            }
+        ];
+    }
+
+    private static List<CalendarEventAttendee> BuildAttendees(IEnumerable<CalendarComposeAttendeeViewModel> attendees)
+    {
+        return attendees
+            .Select(attendee => new CalendarEventAttendee
+            {
+                Id = Guid.NewGuid(),
+                CalendarItemId = Guid.Empty,
+                Name = attendee.HasDistinctDisplayName ? attendee.DisplayName : string.Empty,
+                Email = attendee.Email,
+                AttendenceStatus = AttendeeStatus.NeedsAction,
+                IsOrganizer = false,
+                ResolvedContact = attendee.ResolvedContact
+            })
+            .ToList();
+    }
+
+    private ReminderOption GetDefaultReminderOption()
+    {
+        var reminderMinutes = Math.Max(1, _preferencesService.DefaultReminderDurationInSeconds / 60);
+        return ReminderOptions.FirstOrDefault(option => option.Minutes == reminderMinutes)
+               ?? ReminderOptions.FirstOrDefault();
+    }
+
+    private void UpdateRecurrenceSummary()
+    {
+        if (!HasInitializedComposeDateRange())
+        {
+            RecurrenceSummary = string.Empty;
+            return;
+        }
+
+        var effectiveStart = GetEffectiveStartDateTime();
+        var effectiveEnd = GetEffectiveEndDateTime();
+        var selectedDays = IsDailyRecurrenceSelected
+            ? WeekdayOptions
+                .Where(option => option.IsSelected)
+                .Select(option => option.DayOfWeek)
+                .ToList()
+            : [];
+
+        RecurrenceSummary = CalendarRecurrenceSummaryFormatter.BuildSummary(
+            IsRecurring,
+            effectiveStart,
+            effectiveEnd,
+            IsAllDay,
+            CurrentSettings,
+            SelectedRecurrenceInterval,
+            SelectedRecurrenceFrequencyOption?.Frequency ?? CalendarItemRecurrenceFrequency.Weekly,
+            selectedDays,
+            RecurrenceEndDate);
+    }
+
+    private bool HasInitializedComposeDateRange()
+    {
+        if (StartDate == default)
+        {
+            return false;
+        }
+
+        return !IsAllDay || AllDayEndDate != default;
+    }
+
+    private string BuildRecurrenceRule()
+    {
+        if (!IsRecurring || SelectedRecurrenceFrequencyOption == null)
+            return string.Empty;
+
+        var parts = new List<string>
+        {
+            $"FREQ={SelectedRecurrenceFrequencyOption.Frequency.ToString().ToUpperInvariant()}",
+            $"INTERVAL={SelectedRecurrenceInterval}"
+        };
+
+        var selectedDays = IsDailyRecurrenceSelected
+            ? WeekdayOptions
+                .Where(option => option.IsSelected)
+                .Select(option => option.RuleValue)
+                .ToList()
+            : [];
+
+        if (selectedDays.Count > 0)
+        {
+            parts.Add($"BYDAY={string.Join(",", selectedDays)}");
+        }
+
+        if (RecurrenceEndDate.HasValue)
+        {
+            var untilValue = IsAllDay
+                ? RecurrenceEndDate.Value.ToString("yyyyMMdd", CultureInfo.InvariantCulture)
+                : RecurrenceEndDate.Value.Date.AddDays(1).AddSeconds(-1).ToString("yyyyMMdd'T'HHmmss", CultureInfo.InvariantCulture);
+
+            parts.Add($"UNTIL={untilValue}");
+        }
+
+        return $"RRULE:{string.Join(";", parts)}";
+    }
+
+    private DateTime GetEffectiveStartDateTime()
+        => StartDate.Date.Add(IsAllDay ? TimeSpan.Zero : StartTime);
+
+    private DateTime GetEffectiveEndDateTime()
+        => IsAllDay
+            ? AllDayEndDate.Date
+            : StartDate.Date.Add(EndTime);
+
+    private static (DateTime StartDate, DateTime EndDate) GetDefaultComposeDateRange()
+    {
+        var localNow = DateTime.Now;
+        var roundedMinutes = localNow.Minute switch
+        {
+            < 30 => 30,
+            30 when localNow.Second == 0 && localNow.Millisecond == 0 => 30,
+            _ => 60
+        };
+
+        var startDate = new DateTime(localNow.Year, localNow.Month, localNow.Day, localNow.Hour, 0, 0);
+        startDate = roundedMinutes == 60 ? startDate.AddHours(1) : startDate.AddMinutes(roundedMinutes);
+
+        return (startDate, startDate.AddMinutes(30));
+    }
+
+    private CalendarComposeWeekdayOption CreateWeekdayOption(DayOfWeek dayOfWeek, string ruleValue, string label)
+    {
+        var option = new CalendarComposeWeekdayOption(dayOfWeek, ruleValue, label);
+        option.PropertyChanged += WeekdayOptionPropertyChanged;
+        return option;
+    }
+
+    private void WeekdayOptionPropertyChanged(object sender, PropertyChangedEventArgs e)
+    {
+        if (e.PropertyName == nameof(CalendarComposeWeekdayOption.IsSelected))
+        {
+            UpdateRecurrenceSummary();
+        }
+    }
+
+    private void SelectSingleWeekday(DayOfWeek dayOfWeek)
+    {
+        foreach (var option in WeekdayOptions)
+        {
+            option.IsSelected = option.DayOfWeek == dayOfWeek;
+        }
+    }
+
+    private void ShowValidationMessage(string message)
+    {
+        _dialogService.InfoBarMessage(
+            Translator.CalendarEventCompose_ValidationTitle,
+            message,
+            InfoBarMessageType.Warning);
+    }
+
+    private void AttachmentsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+    {
+        OnPropertyChanged(nameof(HasAttachments));
+    }
+
+    private bool TryAddAttachment(string fileName, string filePath, string fileExtension, long size)
+    {
+        if (!CanAddAttachments ||
+            string.IsNullOrWhiteSpace(filePath) ||
+            Attachments.Any(existing => existing.FilePath.Equals(filePath, StringComparison.OrdinalIgnoreCase)))
+        {
+            return false;
+        }
+
+        Attachments.Add(new CalendarComposeAttachmentViewModel(fileName, filePath, fileExtension, size));
+        return true;
+    }
+
+}
+
+public partial class CalendarComposeFrequencyOption : ObservableObject
+{
+    public CalendarItemRecurrenceFrequency Frequency { get; }
+    public string DisplayText { get; }
+
+    public CalendarComposeFrequencyOption(CalendarItemRecurrenceFrequency frequency, string displayText)
+    {
+        Frequency = frequency;
+        DisplayText = displayText;
+    }
+
+    public string PluralLabel(int interval)
+    {
+        if (interval == 1)
+            return DisplayText;
+
+        return Frequency switch
+        {
+            CalendarItemRecurrenceFrequency.Daily => Translator.CalendarEventCompose_FrequencyDayPlural,
+            CalendarItemRecurrenceFrequency.Weekly => Translator.CalendarEventCompose_FrequencyWeekPlural,
+            CalendarItemRecurrenceFrequency.Monthly => Translator.CalendarEventCompose_FrequencyMonthPlural,
+            CalendarItemRecurrenceFrequency.Yearly => Translator.CalendarEventCompose_FrequencyYearPlural,
+            _ => DisplayText
+        };
+    }
+}
+
+public partial class CalendarComposeWeekdayOption : ObservableObject
+{
+    public DayOfWeek DayOfWeek { get; }
+    public string RuleValue { get; }
+    public string Label { get; }
+    public string FullDayName => DayOfWeek switch
+    {
+        DayOfWeek.Monday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[1],
+        DayOfWeek.Tuesday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[2],
+        DayOfWeek.Wednesday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[3],
+        DayOfWeek.Thursday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[4],
+        DayOfWeek.Friday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[5],
+        DayOfWeek.Saturday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[6],
+        DayOfWeek.Sunday => CultureInfo.CurrentCulture.DateTimeFormat.DayNames[0],
+        _ => string.Empty
+    };
+
+    [ObservableProperty]
+    public partial bool IsSelected { get; set; }
+
+    public CalendarComposeWeekdayOption(DayOfWeek dayOfWeek, string ruleValue, string label)
+    {
+        DayOfWeek = dayOfWeek;
+        RuleValue = ruleValue;
+        Label = label;
+    }
+}
+
+

Wino.Calendar.ViewModels/CalendarNotificationSettingsPageViewModel.cs

@@ -0,0 +1,44 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Calendar.ViewModels;
+
+public partial class CalendarNotificationSettingsPageViewModel : CalendarSettingsSectionViewModelBase
+{
+    [ObservableProperty]
+    public partial int SelectedDefaultReminderIndex { get; set; }
+
+    [ObservableProperty]
+    public partial int SelectedDefaultSnoozeIndex { get; set; }
+
+    public CalendarNotificationSettingsPageViewModel(
+        IPreferencesService preferencesService,
+        ICalendarService calendarService,
+        IAccountService accountService)
+        : base(preferencesService, calendarService, accountService)
+    {
+        LoadReminderOptions();
+        LoadSnoozeOptions();
+
+        SelectedDefaultReminderIndex = GetSelectedReminderIndex();
+        SelectedDefaultSnoozeIndex = GetSelectedSnoozeIndex();
+
+        IsLoaded = true;
+    }
+
+    partial void OnSelectedDefaultReminderIndexChanged(int value)
+    {
+        if (!IsLoaded)
+            return;
+
+        SaveReminderIndex(value);
+    }
+
+    partial void OnSelectedDefaultSnoozeIndexChanged(int value)
+    {
+        if (!IsLoaded)
+            return;
+
+        SaveSnoozeIndex(value);
+    }
+}

Wino.Calendar.ViewModels/CalendarPreferenceSettingsPageViewModel.cs

@@ -0,0 +1,62 @@
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Wino.Calendar.ViewModels.Data;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Calendar.ViewModels;
+
+public partial class CalendarPreferenceSettingsPageViewModel : CalendarSettingsSectionViewModelBase
+{
+    [ObservableProperty]
+    public partial CalendarNewEventBehaviorOption SelectedNewEventBehaviorOption { get; set; }
+
+    [ObservableProperty]
+    public partial AccountCalendarViewModel SelectedNewEventCalendar { get; set; }
+
+    public bool ShouldShowSpecificNewEventCalendar
+        => SelectedNewEventBehaviorOption?.Behavior == NewEventButtonBehavior.AlwaysUseSpecificCalendar;
+
+    public CalendarPreferenceSettingsPageViewModel(
+        IPreferencesService preferencesService,
+        ICalendarService calendarService,
+        IAccountService accountService)
+        : base(preferencesService, calendarService, accountService)
+    {
+        LoadNewEventBehaviorOptions();
+        SelectedNewEventBehaviorOption = GetSelectedNewEventBehaviorOption();
+
+        IsLoaded = true;
+        LoadCalendarsAsync(ApplyStoredNewEventCalendarPreference);
+    }
+
+    partial void OnSelectedNewEventBehaviorOptionChanged(CalendarNewEventBehaviorOption value)
+    {
+        if (!IsLoaded)
+            return;
+
+        OnPropertyChanged(nameof(ShouldShowSpecificNewEventCalendar));
+        SaveNewEventBehavior(SelectedNewEventBehaviorOption, SelectedNewEventCalendar);
+    }
+
+    partial void OnSelectedNewEventCalendarChanged(AccountCalendarViewModel value)
+    {
+        if (!IsLoaded)
+            return;
+
+        SaveNewEventBehavior(SelectedNewEventBehaviorOption, value);
+    }
+
+    private void ApplyStoredNewEventCalendarPreference()
+    {
+        var configuredCalendar = ResolveSelectedNewEventCalendar();
+        if (PreferencesService.NewEventButtonBehavior == NewEventButtonBehavior.AlwaysUseSpecificCalendar && configuredCalendar == null)
+        {
+            SelectedNewEventBehaviorOption = NewEventBehaviorOptions.First(option => option.Behavior == NewEventButtonBehavior.AskEachTime);
+            SelectedNewEventCalendar = null;
+            return;
+        }
+
+        SelectedNewEventCalendar = configuredCalendar ?? ResolveFallbackNewEventCalendar();
+    }
+}

Wino.Calendar.ViewModels/CalendarRenderingSettingsPageViewModel.cs

@@ -0,0 +1,191 @@
+using System;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Calendar.ViewModels;
+
+public partial class CalendarRenderingSettingsPageViewModel : CalendarSettingsSectionViewModelBase
+{
+    [ObservableProperty]
+    public partial double CellHourHeight { get; set; }
+
+    [ObservableProperty]
+    public partial int SelectedFirstDayOfWeekIndex { get; set; }
+
+    [ObservableProperty]
+    public partial bool Is24HourHeaders { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsWorkingHoursEnabled { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan WorkingHourStart { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan WorkingHourEnd { get; set; }
+
+    [ObservableProperty]
+    public partial int WorkingDayStartIndex { get; set; }
+
+    [ObservableProperty]
+    public partial int WorkingDayEndIndex { get; set; }
+
+    [ObservableProperty]
+    public partial string TimedDayHeaderDateFormat { get; set; } = "ddd dd";
+
+    [ObservableProperty]
+    public partial int SelectedTimedDayHeaderFormatPresetIndex { get; set; } = -1;
+
+    public CalendarRenderingSettingsPageViewModel(
+        IPreferencesService preferencesService,
+        ICalendarService calendarService,
+        IAccountService accountService)
+        : base(preferencesService, calendarService, accountService)
+    {
+        SelectedFirstDayOfWeekIndex = DayNames.IndexOf(CalendarCulture.DateTimeFormat.GetDayName(preferencesService.FirstDayOfWeek));
+        Is24HourHeaders = preferencesService.Prefer24HourTimeFormat;
+        IsWorkingHoursEnabled = preferencesService.IsWorkingHoursEnabled;
+        WorkingHourStart = preferencesService.WorkingHourStart;
+        WorkingHourEnd = preferencesService.WorkingHourEnd;
+        CellHourHeight = preferencesService.HourHeight;
+        WorkingDayStartIndex = DayNames.IndexOf(CalendarCulture.DateTimeFormat.GetDayName(preferencesService.WorkingDayStart));
+        WorkingDayEndIndex = DayNames.IndexOf(CalendarCulture.DateTimeFormat.GetDayName(preferencesService.WorkingDayEnd));
+        TimedDayHeaderDateFormat = preferencesService.CalendarTimedDayHeaderDateFormat;
+        SelectedTimedDayHeaderFormatPresetIndex = TimedDayHeaderFormatPresets.IndexOf(TimedDayHeaderDateFormat);
+
+        IsLoaded = true;
+    }
+
+    partial void OnCellHourHeightChanged(double oldValue, double newValue) => SaveSettings();
+
+    partial void OnIs24HourHeadersChanged(bool value)
+    {
+        OnPropertyChanged(nameof(TimedHourLabelPreview));
+        SaveSettings();
+    }
+
+    partial void OnSelectedFirstDayOfWeekIndexChanged(int value) => SaveSettings();
+    partial void OnIsWorkingHoursEnabledChanged(bool value) => SaveSettings();
+    partial void OnWorkingHourStartChanged(TimeSpan value) => SaveSettings();
+    partial void OnWorkingHourEndChanged(TimeSpan value) => SaveSettings();
+    partial void OnWorkingDayStartIndexChanged(int value) => SaveSettings();
+    partial void OnWorkingDayEndIndexChanged(int value) => SaveSettings();
+
+    partial void OnTimedDayHeaderDateFormatChanged(string value)
+    {
+        OnPropertyChanged(nameof(TimedDayHeaderFormatPreview));
+        OnPropertyChanged(nameof(TimedHourLabelPreview));
+
+        var normalizedFormat = string.IsNullOrWhiteSpace(value) ? "ddd dd" : value.Trim();
+        var matchingPresetIndex = TimedDayHeaderFormatPresets
+            .Select((format, index) => new { format, index })
+            .Where(item => string.Equals(item.format, normalizedFormat, StringComparison.Ordinal))
+            .Select(item => item.index)
+            .DefaultIfEmpty(-1)
+            .First();
+
+        if (SelectedTimedDayHeaderFormatPresetIndex != matchingPresetIndex)
+        {
+            SelectedTimedDayHeaderFormatPresetIndex = matchingPresetIndex;
+        }
+
+        SaveSettings();
+    }
+
+    partial void OnSelectedTimedDayHeaderFormatPresetIndexChanged(int value)
+    {
+        if (value < 0 || value >= TimedDayHeaderFormatPresets.Count)
+            return;
+
+        var selectedPreset = TimedDayHeaderFormatPresets[value];
+        if (string.Equals(TimedDayHeaderDateFormat, selectedPreset, StringComparison.Ordinal))
+            return;
+
+        TimedDayHeaderDateFormat = selectedPreset;
+    }
+
+    public string TimedDayHeaderFormatPreview
+    {
+        get
+        {
+            var format = string.IsNullOrWhiteSpace(TimedDayHeaderDateFormat) ? "ddd dd" : TimedDayHeaderDateFormat.Trim();
+            var previewDates = new[]
+            {
+                new DateTime(2026, 3, 23),
+                new DateTime(2026, 3, 24),
+                new DateTime(2026, 3, 25)
+            };
+
+            try
+            {
+                return string.Join(" · ", previewDates.Select(date => date.ToString(format, CalendarCulture)));
+            }
+            catch (FormatException)
+            {
+                return string.Join(" · ", previewDates.Select(date => date.ToString("ddd dd", CalendarCulture)));
+            }
+        }
+    }
+
+    public string TimedHourLabelPreview
+        => string.Join("  ·  ", new[] { 0, 9, 14, 24 }.Select(CurrentSettingsPreviewLabel));
+
+    private string CurrentSettingsPreviewLabel(int hour)
+    {
+        if (Is24HourHeaders)
+            return hour.ToString(CalendarCulture);
+
+        var displayHour = hour % 24;
+        return DateTime.Today.AddHours(displayHour).ToString("h tt", CalendarCulture);
+    }
+
+    private void SaveSettings()
+    {
+        if (!IsLoaded)
+            return;
+
+        PreferencesService.FirstDayOfWeek = SelectedFirstDayOfWeekIndex switch
+        {
+            0 => DayOfWeek.Sunday,
+            1 => DayOfWeek.Monday,
+            2 => DayOfWeek.Tuesday,
+            3 => DayOfWeek.Wednesday,
+            4 => DayOfWeek.Thursday,
+            5 => DayOfWeek.Friday,
+            6 => DayOfWeek.Saturday,
+            _ => throw new ArgumentOutOfRangeException()
+        };
+
+        PreferencesService.WorkingDayStart = WorkingDayStartIndex switch
+        {
+            0 => DayOfWeek.Sunday,
+            1 => DayOfWeek.Monday,
+            2 => DayOfWeek.Tuesday,
+            3 => DayOfWeek.Wednesday,
+            4 => DayOfWeek.Thursday,
+            5 => DayOfWeek.Friday,
+            6 => DayOfWeek.Saturday,
+            _ => throw new ArgumentOutOfRangeException()
+        };
+
+        PreferencesService.WorkingDayEnd = WorkingDayEndIndex switch
+        {
+            0 => DayOfWeek.Sunday,
+            1 => DayOfWeek.Monday,
+            2 => DayOfWeek.Tuesday,
+            3 => DayOfWeek.Wednesday,
+            4 => DayOfWeek.Thursday,
+            5 => DayOfWeek.Friday,
+            6 => DayOfWeek.Saturday,
+            _ => throw new ArgumentOutOfRangeException()
+        };
+
+        PreferencesService.Prefer24HourTimeFormat = Is24HourHeaders;
+        PreferencesService.IsWorkingHoursEnabled = IsWorkingHoursEnabled;
+        PreferencesService.WorkingHourStart = WorkingHourStart;
+        PreferencesService.WorkingHourEnd = WorkingHourEnd;
+        PreferencesService.HourHeight = CellHourHeight;
+        PreferencesService.CalendarTimedDayHeaderDateFormat = TimedDayHeaderDateFormat;
+    }
+}

Wino.Calendar.ViewModels/CalendarSettingsPageViewModel.cs

@@ -1,210 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using System.Globalization;
-using System.Linq;
-using System.Threading.Tasks;
-using CommunityToolkit.Mvvm.ComponentModel;
-using CommunityToolkit.Mvvm.Input;
-using CommunityToolkit.Mvvm.Messaging;
-using Wino.Core.Domain;
-using Wino.Core.Domain.Entities.Shared;
-using Wino.Core.Domain.Enums;
-using Wino.Core.Domain.Interfaces;
-using Wino.Core.Domain.Translations;
-using Wino.Core.ViewModels;
-using Wino.Messaging.Client.Calendar;
-using Wino.Messaging.Client.Navigation;
-
-namespace Wino.Calendar.ViewModels;
-
-public partial class CalendarSettingsPageViewModel : CalendarBaseViewModel
-{
-    [ObservableProperty]
-    public partial double CellHourHeight { get; set; }
-
-    [ObservableProperty]
-    public partial int SelectedFirstDayOfWeekIndex { get; set; }
-
-    [ObservableProperty]
-    public partial bool Is24HourHeaders { get; set; }
-
-    [ObservableProperty]
-    public partial TimeSpan WorkingHourStart { get; set; }
-
-    [ObservableProperty]
-    public partial TimeSpan WorkingHourEnd { get; set; }
-
-    [ObservableProperty]
-    public partial List<string> DayNames { get; set; } = [];
-
-    [ObservableProperty]
-    public partial int WorkingDayStartIndex { get; set; }
-
-    [ObservableProperty]
-    public partial int WorkingDayEndIndex { get; set; }
-
-    [ObservableProperty]
-    public partial List<string> ReminderOptions { get; set; } = [];
-
-    [ObservableProperty]
-    public partial int SelectedDefaultReminderIndex { get; set; }
-
-    public IPreferencesService PreferencesService { get; }
-    private readonly ICalendarService _calendarService;
-    private readonly IAccountService _accountService;
-
-    public ObservableCollection<MailAccount> Accounts { get; } = new ObservableCollection<MailAccount>();
-
-    private readonly bool _isLoaded = false;
-
-    public CalendarSettingsPageViewModel(IPreferencesService preferencesService, ICalendarService calendarService, IAccountService accountService)
-    {
-        PreferencesService = preferencesService;
-        _calendarService = calendarService;
-        _accountService = accountService;
-
-        var currentLanguageLanguageCode = WinoTranslationDictionary.GetLanguageFileNameRelativePath(preferencesService.CurrentLanguage);
-
-        var cultureInfo = new CultureInfo(currentLanguageLanguageCode);
-
-        // Populate the day names list
-        for (var i = 0; i < 7; i++)
-        {
-            DayNames.Add(cultureInfo.DateTimeFormat.DayNames[i]);
-        }
-
-        var cultureFirstDayName = cultureInfo.DateTimeFormat.GetDayName(preferencesService.FirstDayOfWeek);
-        SelectedFirstDayOfWeekIndex = DayNames.IndexOf(cultureFirstDayName);
-        Is24HourHeaders = preferencesService.Prefer24HourTimeFormat;
-        WorkingHourStart = preferencesService.WorkingHourStart;
-        WorkingHourEnd = preferencesService.WorkingHourEnd;
-        CellHourHeight = preferencesService.HourHeight;
-        WorkingDayStartIndex = DayNames.IndexOf(cultureInfo.DateTimeFormat.GetDayName(preferencesService.WorkingDayStart));
-        WorkingDayEndIndex = DayNames.IndexOf(cultureInfo.DateTimeFormat.GetDayName(preferencesService.WorkingDayEnd));
-
-        // Initialize reminder options
-        var predefinedMinutes = _calendarService.GetPredefinedReminderMinutes();
-        ReminderOptions.Add("None");
-        foreach (var minutes in predefinedMinutes)
-        {
-            var displayText = minutes switch
-            {
-                >= 60 => $"{minutes / 60} Hour{(minutes / 60 > 1 ? "s" : "")}",
-                _ => $"{minutes} Minute{(minutes > 1 ? "s" : "")}"
-            };
-            ReminderOptions.Add(displayText);
-        }
-
-        // Set selected index based on current default reminder setting
-        if (preferencesService.DefaultReminderDurationInSeconds == 0)
-        {
-            SelectedDefaultReminderIndex = 0; // None
-        }
-        else
-        {
-            var minutes = (int)(preferencesService.DefaultReminderDurationInSeconds / 60);
-            var index = Array.IndexOf(predefinedMinutes, minutes);
-            SelectedDefaultReminderIndex = index >= 0 ? index + 1 : 0;
-        }
-
-        _isLoaded = true;
-
-        // Load accounts with calendar support
-        LoadAccountsAsync();
-    }
-
-    private async void LoadAccountsAsync()
-    {
-        var accounts = await _accountService.GetAccountsAsync();
-        
-        await Dispatcher.ExecuteOnUIThread(() =>
-        {
-            Accounts.Clear();
-            foreach (var account in accounts)
-            {
-                Accounts.Add(account);
-            }
-        });
-    }
-
-    [RelayCommand]
-    private void NavigateToAccountSettings(MailAccount account)
-    {
-        if (account == null) return;
-        
-        Messenger.Send(new BreadcrumbNavigationRequested(
-            string.Format(Translator.CalendarAccountSettings_Description, account.Name),
-            WinoPage.CalendarAccountSettingsPage,
-            account.Id));
-    }
-
-    partial void OnCellHourHeightChanged(double oldValue, double newValue) => SaveSettings();
-    partial void OnIs24HourHeadersChanged(bool value) => SaveSettings();
-    partial void OnSelectedFirstDayOfWeekIndexChanged(int value) => SaveSettings();
-    partial void OnWorkingHourStartChanged(TimeSpan value) => SaveSettings();
-    partial void OnWorkingHourEndChanged(TimeSpan value) => SaveSettings();
-    partial void OnWorkingDayStartIndexChanged(int value) => SaveSettings();
-    partial void OnWorkingDayEndIndexChanged(int value) => SaveSettings();
-    partial void OnSelectedDefaultReminderIndexChanged(int value) => SaveSettings();
-
-    public void SaveSettings()
-    {
-        if (!_isLoaded) return;
-
-        PreferencesService.FirstDayOfWeek = SelectedFirstDayOfWeekIndex switch
-        {
-            0 => DayOfWeek.Sunday,
-            1 => DayOfWeek.Monday,
-            2 => DayOfWeek.Tuesday,
-            3 => DayOfWeek.Wednesday,
-            4 => DayOfWeek.Thursday,
-            5 => DayOfWeek.Friday,
-            6 => DayOfWeek.Saturday,
-            _ => throw new ArgumentOutOfRangeException()
-        };
-
-        PreferencesService.WorkingDayStart = WorkingDayStartIndex switch
-        {
-            0 => DayOfWeek.Sunday,
-            1 => DayOfWeek.Monday,
-            2 => DayOfWeek.Tuesday,
-            3 => DayOfWeek.Wednesday,
-            4 => DayOfWeek.Thursday,
-            5 => DayOfWeek.Friday,
-            6 => DayOfWeek.Saturday,
-            _ => throw new ArgumentOutOfRangeException()
-        };
-
-        PreferencesService.WorkingDayEnd = WorkingDayEndIndex switch
-        {
-            0 => DayOfWeek.Sunday,
-            1 => DayOfWeek.Monday,
-            2 => DayOfWeek.Tuesday,
-            3 => DayOfWeek.Wednesday,
-            4 => DayOfWeek.Thursday,
-            5 => DayOfWeek.Friday,
-            6 => DayOfWeek.Saturday,
-            _ => throw new ArgumentOutOfRangeException()
-        };
-
-        PreferencesService.Prefer24HourTimeFormat = Is24HourHeaders;
-        PreferencesService.WorkingHourStart = WorkingHourStart;
-        PreferencesService.WorkingHourEnd = WorkingHourEnd;
-        PreferencesService.HourHeight = CellHourHeight;
-
-        // Save default reminder setting
-        if (SelectedDefaultReminderIndex == 0)
-        {
-            PreferencesService.DefaultReminderDurationInSeconds = 0; // None
-        }
-        else
-        {
-            var predefinedMinutes = _calendarService.GetPredefinedReminderMinutes();
-            var minutes = predefinedMinutes[SelectedDefaultReminderIndex - 1];
-            PreferencesService.DefaultReminderDurationInSeconds = minutes * 60;
-        }
-
-        Messenger.Send(new CalendarSettingsUpdatedMessage());
-    }
-}

Wino.Calendar.ViewModels/CalendarSettingsSectionViewModelBase.cs

@@ -0,0 +1,197 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Globalization;
+using System.Linq;
+using Wino.Calendar.ViewModels.Data;
+using Wino.Core.Domain;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Translations;
+using Wino.Core.ViewModels;
+
+namespace Wino.Calendar.ViewModels;
+
+public abstract class CalendarSettingsSectionViewModelBase : CalendarBaseViewModel
+{
+    protected CalendarSettingsSectionViewModelBase(
+        IPreferencesService preferencesService,
+        ICalendarService calendarService,
+        IAccountService accountService)
+    {
+        PreferencesService = preferencesService;
+        CalendarService = calendarService;
+        AccountService = accountService;
+
+        var languageCode = WinoTranslationDictionary.GetLanguageFileNameRelativePath(preferencesService.CurrentLanguage);
+        CalendarCulture = new CultureInfo(languageCode);
+
+        for (var index = 0; index < 7; index++)
+        {
+            DayNames.Add(CalendarCulture.DateTimeFormat.DayNames[index]);
+        }
+    }
+
+    protected IPreferencesService PreferencesService { get; }
+    protected ICalendarService CalendarService { get; }
+    protected IAccountService AccountService { get; }
+    protected CultureInfo CalendarCulture { get; }
+    protected bool IsLoaded { get; set; }
+
+    public ObservableCollection<string> DayNames { get; } = [];
+    public ObservableCollection<string> ReminderOptions { get; } = [];
+    public ObservableCollection<string> SnoozeOptions { get; } = [];
+    public ObservableCollection<CalendarNewEventBehaviorOption> NewEventBehaviorOptions { get; } = [];
+    public ObservableCollection<AccountCalendarViewModel> AvailableNewEventCalendars { get; } = [];
+    public ObservableCollection<string> TimedDayHeaderFormatPresets { get; } =
+    [
+        "ddd dd",
+        "dddd dd",
+        "ddd d MMM",
+        "dd MMM ddd",
+        "M/d ddd"
+    ];
+
+    protected void LoadReminderOptions()
+    {
+        ReminderOptions.Clear();
+
+        var predefinedMinutes = CalendarService.GetPredefinedReminderMinutes();
+        ReminderOptions.Add("None");
+
+        foreach (var minutes in predefinedMinutes)
+        {
+            var displayText = minutes switch
+            {
+                >= 60 => $"{minutes / 60} Hour{(minutes / 60 > 1 ? "s" : "")}",
+                _ => $"{minutes} Minute{(minutes > 1 ? "s" : "")}"
+            };
+
+            ReminderOptions.Add(displayText);
+        }
+    }
+
+    protected int GetSelectedReminderIndex()
+    {
+        if (PreferencesService.DefaultReminderDurationInSeconds == 0)
+            return 0;
+
+        var minutes = (int)(PreferencesService.DefaultReminderDurationInSeconds / 60);
+        var predefinedMinutes = CalendarService.GetPredefinedReminderMinutes();
+        var index = Array.IndexOf(predefinedMinutes, minutes);
+        return index >= 0 ? index + 1 : 0;
+    }
+
+    protected void SaveReminderIndex(int selectedDefaultReminderIndex)
+    {
+        if (selectedDefaultReminderIndex == 0)
+        {
+            PreferencesService.DefaultReminderDurationInSeconds = 0;
+            return;
+        }
+
+        var predefinedMinutes = CalendarService.GetPredefinedReminderMinutes();
+        var minutes = predefinedMinutes[selectedDefaultReminderIndex - 1];
+        PreferencesService.DefaultReminderDurationInSeconds = minutes * 60;
+    }
+
+    protected void LoadSnoozeOptions()
+    {
+        SnoozeOptions.Clear();
+
+        foreach (var snoozeMinutes in CalendarReminderSnoozeOptions.GetSupportedSnoozeMinutes())
+        {
+            SnoozeOptions.Add(string.Format(Translator.CalendarReminder_SnoozeMinutesOption, snoozeMinutes));
+        }
+    }
+
+    protected int GetSelectedSnoozeIndex()
+    {
+        var supportedSnoozeMinutes = CalendarReminderSnoozeOptions.GetSupportedSnoozeMinutes().ToArray();
+        var selectedIndex = Array.IndexOf(supportedSnoozeMinutes, PreferencesService.DefaultSnoozeDurationInMinutes);
+        return selectedIndex >= 0 ? selectedIndex : 0;
+    }
+
+    protected void SaveSnoozeIndex(int selectedDefaultSnoozeIndex)
+    {
+        var supportedSnoozeMinutes = CalendarReminderSnoozeOptions.GetSupportedSnoozeMinutes();
+        if (supportedSnoozeMinutes.Count == 0)
+            return;
+
+        var selectedIndex = Math.Clamp(selectedDefaultSnoozeIndex, 0, supportedSnoozeMinutes.Count - 1);
+        PreferencesService.DefaultSnoozeDurationInMinutes = supportedSnoozeMinutes[selectedIndex];
+    }
+
+    protected void LoadNewEventBehaviorOptions()
+    {
+        NewEventBehaviorOptions.Clear();
+        NewEventBehaviorOptions.Add(new CalendarNewEventBehaviorOption(NewEventButtonBehavior.AskEachTime, Translator.CalendarSettings_NewEventBehavior_AskEachTime));
+        NewEventBehaviorOptions.Add(new CalendarNewEventBehaviorOption(NewEventButtonBehavior.AlwaysUseSpecificCalendar, Translator.CalendarSettings_NewEventBehavior_AlwaysUseSpecificCalendar));
+    }
+
+    protected CalendarNewEventBehaviorOption GetSelectedNewEventBehaviorOption()
+        => NewEventBehaviorOptions.FirstOrDefault(option => option.Behavior == PreferencesService.NewEventButtonBehavior)
+           ?? NewEventBehaviorOptions.First();
+
+    protected async void LoadCalendarsAsync(Action applySelection)
+    {
+        var accounts = await AccountService.GetAccountsAsync().ConfigureAwait(false);
+        var calendarsByAccount = new List<AccountCalendarViewModel>();
+
+        foreach (var account in accounts)
+        {
+            var calendars = await CalendarService.GetAccountCalendarsAsync(account.Id).ConfigureAwait(false);
+            calendarsByAccount.AddRange(calendars.Select(calendar => new AccountCalendarViewModel(account, calendar)));
+        }
+
+        await ExecuteUIThread(() =>
+        {
+            AvailableNewEventCalendars.Clear();
+
+            foreach (var calendar in calendarsByAccount)
+            {
+                AvailableNewEventCalendars.Add(calendar);
+            }
+
+            applySelection();
+        });
+    }
+
+    protected AccountCalendarViewModel ResolveSelectedNewEventCalendar()
+    {
+        var configuredCalendarId = PreferencesService.DefaultNewEventCalendarId;
+        return configuredCalendarId.HasValue
+            ? AvailableNewEventCalendars.FirstOrDefault(calendar => calendar.Id == configuredCalendarId.Value)
+            : null;
+    }
+
+    protected AccountCalendarViewModel ResolveFallbackNewEventCalendar()
+        => AvailableNewEventCalendars.FirstOrDefault(calendar => calendar.IsPrimary)
+           ?? AvailableNewEventCalendars.FirstOrDefault();
+
+    protected void SaveNewEventBehavior(CalendarNewEventBehaviorOption selectedBehaviorOption, AccountCalendarViewModel selectedCalendar)
+    {
+        var newEventBehavior = selectedBehaviorOption?.Behavior ?? NewEventButtonBehavior.AskEachTime;
+        if (newEventBehavior == NewEventButtonBehavior.AlwaysUseSpecificCalendar && selectedCalendar != null)
+        {
+            PreferencesService.NewEventButtonBehavior = NewEventButtonBehavior.AlwaysUseSpecificCalendar;
+            PreferencesService.DefaultNewEventCalendarId = selectedCalendar.Id;
+            return;
+        }
+
+        PreferencesService.NewEventButtonBehavior = NewEventButtonBehavior.AskEachTime;
+        PreferencesService.DefaultNewEventCalendarId = null;
+    }
+}
+
+public sealed class CalendarNewEventBehaviorOption
+{
+    public CalendarNewEventBehaviorOption(NewEventButtonBehavior behavior, string displayText)
+    {
+        Behavior = behavior;
+        DisplayText = displayText;
+    }
+
+    public NewEventButtonBehavior Behavior { get; }
+    public string DisplayText { get; }
+}

Wino.Calendar.ViewModels/Data/AccountCalendarViewModel.cs

@@ -79,5 +79,9 @@ public partial class AccountCalendarViewModel : ObservableObject, IAccountCalend
         set => SetProperty(AccountCalendar.DefaultShowAs, value, AccountCalendar, (u, s) => u.DefaultShowAs = s);
     }
     public Guid Id { get => ((IAccountCalendar)AccountCalendar).Id; set => ((IAccountCalendar)AccountCalendar).Id = value; }
-    public MailAccount MailAccount { get => MailAccount; set => MailAccount = value; }
+    public MailAccount MailAccount
+    {
+        get => AccountCalendar.MailAccount ?? Account;
+        set => AccountCalendar.MailAccount = value;
+    }
 }

Wino.Calendar.ViewModels/Data/CalendarComposeAttachmentViewModel.cs

@@ -0,0 +1,57 @@
+using System;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Calendar;
+using Wino.Core.Extensions;
+
+namespace Wino.Calendar.ViewModels.Data;
+
+public class CalendarComposeAttachmentViewModel
+{
+    public Guid Id { get; } = Guid.NewGuid();
+    public string FileName { get; }
+    public string FilePath { get; }
+    public string FileExtension { get; }
+    public long Size { get; }
+    public string ReadableSize => Size.GetBytesReadable();
+    public MailAttachmentType AttachmentType { get; }
+
+    public CalendarComposeAttachmentViewModel(string fileName, string filePath, string fileExtension, long size)
+    {
+        FileName = fileName;
+        FilePath = filePath;
+        FileExtension = fileExtension;
+        Size = size;
+        AttachmentType = GetAttachmentType(fileExtension);
+    }
+
+    public CalendarEventComposeAttachmentDraft ToDraftModel()
+    {
+        return new CalendarEventComposeAttachmentDraft
+        {
+            Id = Id,
+            FileName = FileName,
+            FilePath = FilePath,
+            FileExtension = FileExtension,
+            Size = Size
+        };
+    }
+
+    private static MailAttachmentType GetAttachmentType(string extension)
+    {
+        if (string.IsNullOrWhiteSpace(extension))
+            return MailAttachmentType.None;
+
+        return extension.ToLowerInvariant() switch
+        {
+            ".exe" => MailAttachmentType.Executable,
+            ".rar" => MailAttachmentType.RarArchive,
+            ".zip" => MailAttachmentType.Archive,
+            ".ogg" or ".mp3" or ".wav" or ".aac" or ".alac" => MailAttachmentType.Audio,
+            ".mp4" or ".wmv" or ".avi" or ".flv" => MailAttachmentType.Video,
+            ".pdf" => MailAttachmentType.PDF,
+            ".htm" or ".html" => MailAttachmentType.HTML,
+            ".png" or ".jpg" or ".jpeg" or ".gif" or ".jiff" => MailAttachmentType.Image,
+            _ => MailAttachmentType.Other
+        };
+    }
+}

Wino.Calendar.ViewModels/Data/CalendarComposeAttendeeViewModel.cs

@@ -0,0 +1,23 @@
+using Wino.Core.Domain.Entities.Shared;
+
+namespace Wino.Calendar.ViewModels.Data;
+
+public class CalendarComposeAttendeeViewModel : IContactDisplayItem
+{
+    public string DisplayName { get; }
+    public string Email { get; }
+    public AccountContact ResolvedContact { get; }
+    public string Address => Email;
+    public AccountContact PreviewContact => ResolvedContact;
+    public bool HasDistinctDisplayName => !string.IsNullOrWhiteSpace(DisplayName) && !DisplayName.Equals(Email, System.StringComparison.OrdinalIgnoreCase);
+
+    public CalendarComposeAttendeeViewModel(string displayName, string email, AccountContact resolvedContact = null)
+    {
+        DisplayName = string.IsNullOrWhiteSpace(displayName) ? email : displayName;
+        Email = email;
+        ResolvedContact = resolvedContact;
+    }
+
+    public static CalendarComposeAttendeeViewModel FromContact(AccountContact contact)
+        => new(contact.Name, contact.Address, contact);
+}

Wino.Calendar.ViewModels/Data/CalendarItemViewModel.cs

@@ -33,8 +33,10 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
         }
         set
         {
-            // When setting from UI (in local time), convert to event's timezone for storage.
+            // All-day events use floating dates and should not shift across timezones.
-            CalendarItem.StartDate = value.ToTimeZoneFromLocal(CalendarItem.StartTimeZone);
+            CalendarItem.StartDate = CalendarItem.IsAllDayEvent
+                ? value.Date
+                : value.ToTimeZoneFromLocal(CalendarItem.StartTimeZone);
         }
     }
 
@@ -70,6 +72,7 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
     public bool IsRecurringEvent => CalendarItem.IsRecurringEvent;
     public bool IsRecurringChild => CalendarItem.IsRecurringChild;
     public bool IsRecurringParent => CalendarItem.IsRecurringParent;
+    public bool CanDragDrop => CalendarItem.CanChangeStartAndEndDate;
 
     [ObservableProperty]
     public partial bool IsSelected { get; set; }
@@ -155,6 +158,7 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
         OnPropertyChanged(nameof(IsRecurringEvent));
         OnPropertyChanged(nameof(IsRecurringChild));
         OnPropertyChanged(nameof(IsRecurringParent));
+        OnPropertyChanged(nameof(CanDragDrop));
         OnPropertyChanged(nameof(AssignedCalendar));
         OnPropertyChanged(nameof(DisplayTitle));
     }

Wino.Calendar.ViewModels/Data/GroupedAccountCalendarViewModel.cs

@@ -1,10 +1,11 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.Linq;
 using CommunityToolkit.Mvvm.ComponentModel;
 using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Models.Synchronization;
 
 namespace Wino.Calendar.ViewModels.Data;
 
@@ -20,6 +21,7 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
     {
         Account = account;
         AccountCalendars = new ObservableCollection<AccountCalendarViewModel>(calendarViewModels);
+        AccountColorHex = account.AccountColorHex;
 
         ManageIsCheckedState();
 
@@ -31,7 +33,7 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
         AccountCalendars.CollectionChanged += CalendarListUpdated;
     }
 
-    private void CalendarListUpdated(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+    private void CalendarListUpdated(object sender, NotifyCollectionChangedEventArgs e)
     {
         if (e.Action == NotifyCollectionChangedAction.Add)
         {
@@ -58,13 +60,11 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
 
     private void CalendarPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
     {
-        if (sender is AccountCalendarViewModel viewModel)
+        if (sender is AccountCalendarViewModel viewModel &&
+            e.PropertyName == nameof(AccountCalendarViewModel.IsChecked))
         {
-            if (e.PropertyName == nameof(AccountCalendarViewModel.IsChecked))
+            ManageIsCheckedState();
-            {
+            UpdateCalendarCheckedState(viewModel, viewModel.IsChecked, true);
-                ManageIsCheckedState();
-                UpdateCalendarCheckedState(viewModel, viewModel.IsChecked, true);
-            }
         }
     }
 
@@ -74,11 +74,58 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
     [ObservableProperty]
     public partial bool? IsCheckedState { get; set; } = true;
 
-    private bool _isExternalPropChangeBlocked = false;
+    [ObservableProperty]
+    public partial string AccountColorHex { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(CanSynchronize), nameof(IsSynchronizationProgressVisible), nameof(IsProgressIndeterminate))]
+    public partial bool IsSynchronizationInProgress { get; set; }
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(SynchronizationProgress), nameof(SynchronizationProgressValue), nameof(IsProgressIndeterminate))]
+    public partial int TotalItemsToSync { get; set; }
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(SynchronizationProgress), nameof(SynchronizationProgressValue), nameof(IsProgressIndeterminate))]
+    public partial int RemainingItemsToSync { get; set; }
+
+    [ObservableProperty]
+    public partial string SynchronizationStatus { get; set; } = string.Empty;
+
+    public bool CanSynchronize => !IsSynchronizationInProgress;
+    public bool IsSynchronizationProgressVisible => IsSynchronizationInProgress;
+    public bool IsProgressIndeterminate => IsSynchronizationInProgress && TotalItemsToSync <= 0;
+
+    public double SynchronizationProgress
+    {
+        get
+        {
+            if (TotalItemsToSync <= 0)
+                return 0;
+
+            return ((double)(TotalItemsToSync - RemainingItemsToSync) / TotalItemsToSync) * 100;
+        }
+    }
+
+    public double SynchronizationProgressValue => SynchronizationProgress;
+
+    private bool _isExternalPropChangeBlocked;
+
+    public void ApplySynchronizationProgress(AccountSynchronizationProgress progress)
+    {
+        if (progress == null || progress.AccountId != Account.Id)
+            return;
+
+        IsSynchronizationInProgress = progress.IsInProgress;
+        TotalItemsToSync = progress.TotalUnits;
+        RemainingItemsToSync = progress.RemainingUnits;
+        SynchronizationStatus = progress.Status ?? string.Empty;
+    }
 
     private void ManageIsCheckedState()
     {
-        if (_isExternalPropChangeBlocked) return;
+        if (_isExternalPropChangeBlocked)
+            return;
 
         _isExternalPropChangeBlocked = true;
 
@@ -100,17 +147,13 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
 
     partial void OnIsCheckedStateChanged(bool? oldValue, bool? newValue)
     {
-        if (_isExternalPropChangeBlocked) return;
+        if (_isExternalPropChangeBlocked)
-
+            return;
-        // Update is triggered by user on the three-state checkbox.
-        // We should not report all changes one by one.
 
         _isExternalPropChangeBlocked = true;
 
         if (newValue == null)
         {
-            // Only primary calendars must be checked.
-
             foreach (var calendar in AccountCalendars)
             {
                 UpdateCalendarCheckedState(calendar, calendar.IsPrimary);
@@ -125,7 +168,6 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
         }
 
         _isExternalPropChangeBlocked = false;
-
         CollectiveSelectionStateChanged?.Invoke(this, EventArgs.Empty);
     }
 
@@ -133,13 +175,28 @@ public partial class GroupedAccountCalendarViewModel : ObservableObject
     {
         var currentValue = accountCalendarViewModel.IsChecked;
 
-        if (currentValue == newValue && !ignoreValueCheck) return;
+        if (currentValue == newValue && !ignoreValueCheck)
+            return;
 
         accountCalendarViewModel.IsChecked = newValue;
 
-        // No need to report.
+        if (_isExternalPropChangeBlocked)
-        if (_isExternalPropChangeBlocked == true) return;
+            return;
 
         CalendarSelectionStateChanged?.Invoke(this, accountCalendarViewModel);
     }
+
+    public void UpdateAccount(MailAccount updatedAccount)
+    {
+        if (updatedAccount == null || updatedAccount.Id != Account.Id)
+            return;
+
+        Account.Name = updatedAccount.Name;
+        Account.Address = updatedAccount.Address;
+        Account.AccountColorHex = updatedAccount.AccountColorHex;
+        Account.AttentionReason = updatedAccount.AttentionReason;
+        Account.MergedInboxId = updatedAccount.MergedInboxId;
+        AccountColorHex = updatedAccount.AccountColorHex;
+        OnPropertyChanged(nameof(Account));
+    }
 }

Wino.Calendar.ViewModels/EventDetailsPageViewModel.cs

@@ -12,9 +12,11 @@ using Serilog;
 using Wino.Calendar.ViewModels.Data;
 using Wino.Core.Domain;
 using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Extensions;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
 using Wino.Core.Domain.Models.Calendar;
+using Wino.Core.Domain.Models;
 using Wino.Core.Domain.Models.Navigation;
 using Wino.Core.Services;
 using Wino.Core.ViewModels;
@@ -31,6 +33,8 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
     private readonly IWinoRequestDelegator _winoRequestDelegator;
     private readonly INavigationService _navigationService;
     private readonly IUnderlyingThemeService _underlyingThemeService;
+    private readonly INotificationBuilder _notificationBuilder;
+    private readonly IContactService _contactService;
 
     public CalendarSettings CurrentSettings { get; }
     public INativeAppService NativeAppService => _nativeAppService;
@@ -143,7 +147,9 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
                                      IMailDialogService dialogService,
                                      IWinoRequestDelegator winoRequestDelegator,
                                      INavigationService navigationService,
-                                     IUnderlyingThemeService underlyingThemeService)
+                                     INotificationBuilder notificationBuilder,
+                                     IUnderlyingThemeService underlyingThemeService,
+                                     IContactService contactService)
     {
         _calendarService = calendarService;
         _nativeAppService = nativeAppService;
@@ -152,22 +158,23 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         _winoRequestDelegator = winoRequestDelegator;
         _navigationService = navigationService;
         _underlyingThemeService = underlyingThemeService;
+        _notificationBuilder = notificationBuilder;
+        _contactService = contactService;
 
         CurrentSettings = _preferencesService.GetCurrentCalendarSettings();
         IsDarkWebviewRenderer = _underlyingThemeService.IsUnderlyingThemeDark();
 
-        // Initialize Show As options
+        foreach (var showAs in CalendarItemActionOptions.ShowAsOptions)
-        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Free));
+        {
-        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Tentative));
+            ShowAsOptions.Add(new ShowAsOption(showAs));
-        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.Busy));
+        }
-        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.OutOfOffice));
-        ShowAsOptions.Add(new ShowAsOption(CalendarItemShowAs.WorkingElsewhere));
-        SelectedShowAsOption = ShowAsOptions[2]; // Default to Busy
 
-        // Initialize RSVP status options
+        SelectedShowAsOption = ShowAsOptions.FirstOrDefault(option => option.ShowAs == CalendarItemShowAs.Busy) ?? ShowAsOptions.FirstOrDefault();
-        RsvpStatusOptions.Add(new RsvpStatusOption(CalendarItemStatus.Accepted));
+
-        RsvpStatusOptions.Add(new RsvpStatusOption(CalendarItemStatus.Tentative));
+        foreach (var responseStatus in CalendarItemActionOptions.ResponseOptions)
-        RsvpStatusOptions.Add(new RsvpStatusOption(CalendarItemStatus.Cancelled));
+        {
+            RsvpStatusOptions.Add(new RsvpStatusOption(responseStatus));
+        }
     }
 
     public override async void OnNavigatedTo(NavigationMode mode, object parameters)
@@ -180,20 +187,20 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         await LoadCalendarItemTargetAsync(args);
     }
 
-    protected override async void OnCalendarItemUpdated(CalendarItem calendarItem, CalendarItemUpdateSource source)
+    protected override async void OnCalendarItemUpdated(CalendarItem calendarItem, EntityUpdateSource source)
     {
         base.OnCalendarItemUpdated(calendarItem, source);
 
         // If the current event was updated, reload it
-        if (CurrentEvent?.CalendarItem?.Id == calendarItem.Id || CurrentEvent?.CalendarItem.RecurringCalendarItemId == calendarItem.Id)
+        if (IsCurrentEventMatch(calendarItem))
         {
             // Reflect client-side optimistic changes immediately; fallback to DB for server updates.
-            if (source == CalendarItemUpdateSource.ClientUpdated || source == CalendarItemUpdateSource.ClientReverted)
+            if (source == EntityUpdateSource.ClientUpdated || source == EntityUpdateSource.ClientReverted)
             {
                 var previousAttendees = CurrentEvent?.Attendees?.ToList() ?? [];
                 CurrentEvent = new CalendarItemViewModel(calendarItem)
                 {
-                    IsBusy = source == CalendarItemUpdateSource.ClientUpdated
+                    IsBusy = source == EntityUpdateSource.ClientUpdated
                 };
 
                 foreach (var attendee in previousAttendees)
@@ -214,17 +221,54 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         }
     }
 
-    protected override void OnCalendarItemDeleted(CalendarItem calendarItem)
+    protected override async void OnCalendarItemAdded(CalendarItem calendarItem, EntityUpdateSource source)
     {
-        base.OnCalendarItemDeleted(calendarItem);
+        base.OnCalendarItemAdded(calendarItem, source);
+
+        if (!IsCurrentEventMatch(calendarItem))
+            return;
+
+        if (source == EntityUpdateSource.ClientUpdated || source == EntityUpdateSource.ClientReverted)
+        {
+            CurrentEvent = new CalendarItemViewModel(calendarItem)
+            {
+                IsBusy = source == EntityUpdateSource.ClientUpdated
+            };
+
+            return;
+        }
+
+        var refreshedEvent = await _calendarService.GetCalendarItemAsync(calendarItem.Id);
+        if (refreshedEvent != null)
+        {
+            CurrentEvent = new CalendarItemViewModel(refreshedEvent);
+            await LoadAttendeesAsync(refreshedEvent.Id, refreshedEvent);
+        }
+    }
+
+    protected override void OnCalendarItemDeleted(CalendarItem calendarItem, EntityUpdateSource source)
+    {
+        base.OnCalendarItemDeleted(calendarItem, source);
 
         // If the current event was deleted, navigate back
-        if (CurrentEvent?.CalendarItem?.Id == calendarItem.Id || CurrentEvent?.CalendarItem.RecurringCalendarItemId == calendarItem.Id)
+        if (IsCurrentEventMatch(calendarItem))
         {
-            _navigationService.GoBack();
+            NavigateBackToCalendar(forceReload: true);
         }
     }
 
+    private bool IsCurrentEventMatch(CalendarItem calendarItem)
+    {
+        if (CurrentEvent?.CalendarItem == null || calendarItem == null)
+            return false;
+
+        var trackedLocalItemId = calendarItem.RemoteEventId.GetClientTrackingId();
+
+        return CurrentEvent.CalendarItem.Id == calendarItem.Id ||
+               (trackedLocalItemId.HasValue && CurrentEvent.CalendarItem.Id == trackedLocalItemId.Value) ||
+               CurrentEvent.CalendarItem.RecurringCalendarItemId == calendarItem.Id;
+    }
+
     private async Task LoadCalendarItemTargetAsync(CalendarItemTarget target)
     {
         try
@@ -256,18 +300,36 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
     private async Task LoadAttendeesAsync(Guid calendarItemId, CalendarItem calendarItem)
     {
-        CurrentEvent.Attendees.Clear();
-
         var attendees = await _calendarService.GetAttendeesAsync(calendarItemId);
 
+        // Resolve contacts for all attendees in a single batch DB query.
+        var emails = attendees
+            .Where(a => !string.IsNullOrEmpty(a.Email))
+            .Select(a => a.Email)
+            .ToList();
+
+        if (!string.IsNullOrEmpty(calendarItem.OrganizerEmail))
+            emails.Add(calendarItem.OrganizerEmail);
+
+        var contacts = await _contactService.GetContactsByAddressesAsync(emails).ConfigureAwait(false);
+        var contactLookup = contacts.ToDictionary(c => c.Address, StringComparer.OrdinalIgnoreCase);
+
+        foreach (var attendee in attendees)
+        {
+            if (!string.IsNullOrEmpty(attendee.Email) && contactLookup.TryGetValue(attendee.Email, out var contact))
+                attendee.ResolvedContact = contact;
+        }
+
         // Separate organizer from other attendees to ensure organizer is always first
         var organizer = attendees.FirstOrDefault(a => a.IsOrganizer);
         var nonOrganizerAttendees = attendees.Where(a => !a.IsOrganizer).ToList();
 
+        var attendeesForUi = new List<CalendarEventAttendee>();
+
         // If the organizer is in the list, add them first
         if (organizer != null)
         {
-            CurrentEvent.Attendees.Add(organizer);
+            attendeesForUi.Add(organizer);
         }
         else if (!string.IsNullOrEmpty(calendarItem.OrganizerEmail))
         {
@@ -281,14 +343,31 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
                 IsOrganizer = true,
                 AttendenceStatus = AttendeeStatus.Accepted
             };
-            CurrentEvent.Attendees.Add(organizerAttendee);
+
+            if (contactLookup.TryGetValue(calendarItem.OrganizerEmail, out var organizerContact))
+                organizerAttendee.ResolvedContact = organizerContact;
+
+            attendeesForUi.Add(organizerAttendee);
         }
 
         // Add all other attendees after the organizer
         foreach (var item in nonOrganizerAttendees)
         {
-            CurrentEvent.Attendees.Add(item);
+            attendeesForUi.Add(item);
         }
+
+        await ExecuteUIThread(() =>
+        {
+            if (CurrentEvent == null)
+                return;
+
+            CurrentEvent.Attendees.Clear();
+
+            foreach (var attendee in attendeesForUi)
+            {
+                CurrentEvent.Attendees.Add(attendee);
+            }
+        });
     }
 
     private async Task LoadAttachmentsAsync(Guid calendarItemId)
@@ -411,7 +490,7 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
             await _winoRequestDelegator.ExecuteAsync(preparationRequest);
 
-            _navigationService.GoBack();
+            NavigateBackToCalendar(forceReload: true);
         }
         catch (Exception ex)
         {
@@ -448,8 +527,7 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
             await _winoRequestDelegator.ExecuteAsync(preparationRequest);
 
-            // Navigate back after successful deletion
+            NavigateBackToCalendar(forceReload: true);
-            _navigationService.GoBack();
         }
         catch (Exception ex)
         {
@@ -457,6 +535,28 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         }
     }
 
+    private void NavigateBackToCalendar(bool forceReload)
+    {
+        var navigationDate = CurrentEvent?.CalendarItem.LocalStartDate ?? DateTime.Now;
+
+        _navigationService.Navigate(
+            WinoPage.CalendarPage,
+            new CalendarPageNavigationArgs
+            {
+                NavigationDate = navigationDate,
+                ForceReload = forceReload
+            });
+    }
+
+    public override async Task KeyboardShortcutHook(KeyboardShortcutTriggerDetails args)
+    {
+        if (args.Handled || args.Mode != WinoApplicationMode.Calendar || args.Action != KeyboardShortcutAction.Delete)
+            return;
+
+        await DeleteAsync();
+        args.Handled = true;
+    }
+
     [RelayCommand]
     private Task JoinOnlineAsync()
     {
@@ -466,6 +566,24 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
         return _nativeAppService.LaunchUriAsync(new Uri(CurrentEvent.CalendarItem.HtmlLink));
     }
 
+    [RelayCommand]
+    private Task CreateTestNotificationAsync()
+    {
+        if (CurrentEvent?.CalendarItem == null)
+            return Task.CompletedTask;
+
+        var reminderDurationInSeconds = Reminders?
+            .Where(x => x.DurationInSeconds > 0)
+            .OrderByDescending(x => x.DurationInSeconds)
+            .Select(x => x.DurationInSeconds)
+            .FirstOrDefault() ?? 0;
+
+        if (reminderDurationInSeconds <= 0)
+            reminderDurationInSeconds = Math.Max(_preferencesService.DefaultReminderDurationInSeconds, 30 * 60);
+
+        return _notificationBuilder.CreateCalendarReminderNotificationAsync(CurrentEvent.CalendarItem, reminderDurationInSeconds);
+    }
+
     [RelayCommand]
     private void ToggleRsvpPanel()
     {

Wino.Calendar.ViewModels/Interfaces/IAccountCalendarStateService.cs

@@ -29,5 +29,6 @@ public interface IAccountCalendarStateService : INotifyPropertyChanged
     /// </summary>
     IEnumerable<AccountCalendarViewModel> ActiveCalendars { get; }
     IEnumerable<AccountCalendarViewModel> AllCalendars { get; }
+    bool IsAnySynchronizationInProgress { get; }
     ReadOnlyObservableGroupedCollection<MailAccount, AccountCalendarViewModel> GroupedCalendars { get; set; }
 }

Wino.Calendar.ViewModels/Messages/CalendarItemContextActionRequestedMessage.cs

@@ -0,0 +1,8 @@
+using Wino.Calendar.ViewModels.Data;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Calendar.ViewModels.Messages;
+
+public sealed record CalendarItemContextActionRequestedMessage(
+    CalendarItemViewModel CalendarItemViewModel,
+    CalendarContextMenuAction Action);

Wino.Calendar.ViewModels/Messages/CalendarItemTappedMessage.cs

@@ -1,16 +1,12 @@
 using Wino.Calendar.ViewModels.Data;
-using Wino.Core.Domain.Models.Calendar;
-
 namespace Wino.Calendar.ViewModels.Messages;
 
 public class CalendarItemTappedMessage
 {
-    public CalendarItemTappedMessage(CalendarItemViewModel calendarItemViewModel, CalendarDayModel clickedPeriod)
+    public CalendarItemTappedMessage(CalendarItemViewModel calendarItemViewModel)
     {
         CalendarItemViewModel = calendarItemViewModel;
-        ClickedPeriod = clickedPeriod;
     }
 
     public CalendarItemViewModel CalendarItemViewModel { get; }
-    public CalendarDayModel ClickedPeriod { get; }
 }

Wino.Calendar.ViewModels/Wino.Calendar.ViewModels.csproj

@@ -10,7 +10,8 @@
 		<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
 	</PropertyGroup>
 	<ItemGroup>
-	  <PackageReference Include="TimePeriodLibrary.NET" />
+		<PackageReference Include="TimePeriodLibrary.NET" />
+		<PackageReference Include="EmailValidation" />
 	</ItemGroup>
 
 	<ItemGroup>

Wino.Core.Domain/AppUrls.cs

@@ -0,0 +1,10 @@
+namespace Wino.Core.Domain;
+
+public static class AppUrls
+{
+    public const string Website = "https://www.winomail.app";
+    public const string Discord = "https://discord.gg/windows-apps-hub-714581497222398064";
+    public const string GitHub = "https://github.com/bkaankose/Wino-Mail/";
+    public const string PrivacyPolicy = "https://www.winomail.app/support/privacy";
+    public const string Paypal = "https://paypal.me/bkaankose?country.x=PL&locale.x=en_US";
+}

Wino.Core.Domain/BasicTypesJsonContext.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Text.Json.Serialization;
+using Wino.Core.Domain.Models.Updates;
 
 namespace Wino.Core.Domain;
 
@@ -8,4 +9,6 @@ namespace Wino.Core.Domain;
 [JsonSerializable(typeof(int))]
 [JsonSerializable(typeof(List<string>))]
 [JsonSerializable(typeof(bool))]
+[JsonSerializable(typeof(UpdateNotes))]
+[JsonSerializable(typeof(List<UpdateNoteSection>))]
 public partial class BasicTypesJsonContext : JsonSerializerContext;

Wino.Core.Domain/CalendarItemActionOptions.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain;
+
+public static class CalendarItemActionOptions
+{
+    public static IReadOnlyList<CalendarItemShowAs> ShowAsOptions { get; } =
+    [
+        CalendarItemShowAs.Free,
+        CalendarItemShowAs.Tentative,
+        CalendarItemShowAs.Busy,
+        CalendarItemShowAs.OutOfOffice,
+        CalendarItemShowAs.WorkingElsewhere
+    ];
+
+    public static IReadOnlyList<CalendarItemStatus> ResponseOptions { get; } =
+    [
+        CalendarItemStatus.Accepted,
+        CalendarItemStatus.Tentative,
+        CalendarItemStatus.Cancelled
+    ];
+}

Wino.Core.Domain/CalendarRecurrenceSummaryFormatter.cs

@@ -0,0 +1,126 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Core.Domain;
+
+public static class CalendarRecurrenceSummaryFormatter
+{
+    private static readonly DayOfWeek[] OrderedDays =
+    [
+        DayOfWeek.Monday,
+        DayOfWeek.Tuesday,
+        DayOfWeek.Wednesday,
+        DayOfWeek.Thursday,
+        DayOfWeek.Friday,
+        DayOfWeek.Saturday,
+        DayOfWeek.Sunday
+    ];
+
+    public static string BuildSummary(
+        bool isRecurring,
+        DateTimeOffset effectiveStart,
+        DateTimeOffset effectiveEnd,
+        bool isAllDay,
+        CalendarSettings settings,
+        int interval,
+        CalendarItemRecurrenceFrequency frequency,
+        IReadOnlyCollection<DayOfWeek> daysOfWeek,
+        DateTimeOffset? recurrenceEndDate)
+    {
+        var culture = settings?.CultureInfo ?? CultureInfo.CurrentCulture;
+        var timeSummary = isAllDay
+            ? Translator.CalendarItemAllDay
+            : string.Format(
+                culture,
+                Translator.CalendarEventCompose_TimeRangeSummary,
+                effectiveStart.ToString(settings?.DayHeaderDisplayType == DayHeaderDisplayType.TwentyFourHour ? "HH:mm" : "h:mm tt", culture),
+                effectiveEnd.ToString(settings?.DayHeaderDisplayType == DayHeaderDisplayType.TwentyFourHour ? "HH:mm" : "h:mm tt", culture));
+
+        if (!isRecurring)
+        {
+            return string.Format(
+                culture,
+                Translator.CalendarEventCompose_SingleOccurrenceSummary,
+                effectiveStart.ToString("dddd yyyy-MM-dd", culture),
+                timeSummary);
+        }
+
+        var normalizedDays = NormalizeDays(daysOfWeek);
+        var isEveryDay = (frequency == CalendarItemRecurrenceFrequency.Daily && interval == 1) ||
+                         (frequency == CalendarItemRecurrenceFrequency.Weekly && interval == 1 && normalizedDays.Count == 7);
+
+        var cadenceSummary = isEveryDay
+            ? $"{Translator.CalendarEventCompose_Every} {Translator.CalendarEventCompose_FrequencyDay}"
+            : interval == 1
+                ? $"{Translator.CalendarEventCompose_Every} {GetSingularFrequencyLabel(frequency)}"
+                : $"{Translator.CalendarEventCompose_Every} {interval.ToString(culture)} {GetPluralFrequencyLabel(frequency)}";
+
+        var weekdaySummary = string.Empty;
+        if (frequency == CalendarItemRecurrenceFrequency.Weekly && normalizedDays.Count > 0 && normalizedDays.Count < 7)
+        {
+            weekdaySummary = string.Format(
+                culture,
+                Translator.CalendarEventCompose_WeekdaySummary,
+                string.Join(", ", normalizedDays.Select(day => culture.DateTimeFormat.GetDayName(day))));
+        }
+
+        var untilSummary = recurrenceEndDate.HasValue
+            ? string.Format(
+                culture,
+                Translator.CalendarEventCompose_UntilSummary,
+                recurrenceEndDate.Value.ToString("ddd yyyy-MM-dd", culture))
+            : string.Empty;
+
+        return string.Format(
+            culture,
+            Translator.CalendarEventCompose_RecurringSummarySmart,
+            cadenceSummary,
+            weekdaySummary,
+            timeSummary,
+            effectiveStart.ToString("dddd yyyy-MM-dd", culture),
+            untilSummary).Trim();
+    }
+
+    private static IReadOnlyList<DayOfWeek> NormalizeDays(IReadOnlyCollection<DayOfWeek> daysOfWeek)
+    {
+        if (daysOfWeek == null || daysOfWeek.Count == 0)
+        {
+            return [];
+        }
+
+        return daysOfWeek
+            .Distinct()
+            .OrderBy(day => Array.IndexOf(OrderedDays, day))
+            .ToList();
+    }
+
+    private static string GetSingularFrequencyLabel(CalendarItemRecurrenceFrequency frequency)
+    {
+        return frequency switch
+        {
+            CalendarItemRecurrenceFrequency.Daily => Translator.CalendarEventCompose_FrequencyDay,
+            CalendarItemRecurrenceFrequency.Weekly => Translator.CalendarEventCompose_FrequencyWeek,
+            CalendarItemRecurrenceFrequency.Monthly => Translator.CalendarEventCompose_FrequencyMonth,
+            CalendarItemRecurrenceFrequency.Yearly => Translator.CalendarEventCompose_FrequencyYear,
+            _ => Translator.CalendarEventCompose_FrequencyWeek
+        };
+    }
+
+    private static string GetPluralFrequencyLabel(CalendarItemRecurrenceFrequency frequency)
+    {
+        return frequency switch
+        {
+            CalendarItemRecurrenceFrequency.Daily => Translator.CalendarEventCompose_FrequencyDayPlural,
+            CalendarItemRecurrenceFrequency.Weekly => Translator.CalendarEventCompose_FrequencyWeekPlural,
+            CalendarItemRecurrenceFrequency.Monthly => Translator.CalendarEventCompose_FrequencyMonthPlural,
+            CalendarItemRecurrenceFrequency.Yearly => Translator.CalendarEventCompose_FrequencyYearPlural,
+            _ => Translator.CalendarEventCompose_FrequencyWeekPlural
+        };
+    }
+}
+
+

Wino.Core.Domain/CalendarReminderSnoozeOptions.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Wino.Core.Domain;
+
+public static class CalendarReminderSnoozeOptions
+{
+    private static readonly int[] SupportedSnoozeMinutes = [5, 10, 15, 30];
+
+    public static IReadOnlyList<int> GetSupportedSnoozeMinutes()
+        => SupportedSnoozeMinutes;
+
+    public static IReadOnlyList<int> GetAllowedSnoozeMinutes(long reminderDurationInSeconds, long defaultReminderDurationInSeconds)
+    {
+        var reminderMinutes = (int)Math.Max(0, reminderDurationInSeconds / 60);
+
+        if (reminderMinutes <= 0)
+            return [];
+
+        var maxSnoozeMinutes = reminderMinutes;
+        var defaultReminderMinutes = (int)Math.Max(0, defaultReminderDurationInSeconds / 60);
+
+        if (defaultReminderMinutes > 0)
+            maxSnoozeMinutes = Math.Min(maxSnoozeMinutes, defaultReminderMinutes);
+
+        return SupportedSnoozeMinutes.Where(minutes => minutes <= maxSnoozeMinutes).ToArray();
+    }
+}

Wino.Core.Domain/Collections/DayRangeCollection.cs

@@ -1,41 +0,0 @@
-using System.Linq;
-using Wino.Core.Domain.Interfaces;
-using Wino.Core.Domain.Models.Calendar;
-
-namespace Wino.Core.Domain.Collections;
-
-public class DayRangeCollection : ObservableRangeCollection<DayRangeRenderModel>
-{
-    /// <summary>
-    /// Gets the range of dates that are currently displayed in the collection.
-    /// </summary>
-    public DateRange DisplayRange
-    {
-        get
-        {
-            if (Count == 0) return null;
-
-            var minimumLoadedDate = this[0].CalendarRenderOptions.DateRange.StartDate;
-            var maximumLoadedDate = this[Count - 1].CalendarRenderOptions.DateRange.EndDate;
-
-            return new DateRange(minimumLoadedDate, maximumLoadedDate);
-        }
-    }
-
-    public void RemoveCalendarItem(ICalendarItem calendarItem)
-    {
-        foreach (var dayRange in this)
-        {
-
-        }
-    }
-
-    public void AddCalendarItem(ICalendarItem calendarItem)
-    {
-        foreach (var dayRange in this)
-        {
-            var calendarDayModel = dayRange.CalendarDays.FirstOrDefault(x => x.Period.HasInside(calendarItem.Period.Start));
-            calendarDayModel?.EventsCollection.AddCalendarItem(calendarItem);
-        }
-    }
-}

Wino.Core.Domain/Constants.cs

@@ -1,4 +1,4 @@
-namespace Wino.Core.Domain;
+namespace Wino.Core.Domain;
 
 public static class Constants
 {
@@ -6,6 +6,8 @@ public static class Constants
     /// MIME header that exists in all the drafts created from Wino.
     /// </summary>
     public const string WinoLocalDraftHeader = "X-Wino-Draft-Id";
+    public const string DispositionNotificationToHeader = "Disposition-Notification-To";
+    public const string OriginalMessageIdHeader = "Original-Message-ID";
     public const string LocalDraftStartPrefix = "localDraft_";
 
     public const string CalendarEventRecurrenceRuleSeperator = "___";
@@ -16,10 +18,15 @@ public static class Constants
     public const string ToastCalendarItemIdKey = nameof(ToastCalendarItemIdKey);
     public const string ToastCalendarActionKey = nameof(ToastCalendarActionKey);
     public const string ToastCalendarNavigateAction = nameof(ToastCalendarNavigateAction);
+    public const string ToastCalendarJoinOnlineAction = nameof(ToastCalendarJoinOnlineAction);
+    public const string ToastCalendarSnoozeAction = nameof(ToastCalendarSnoozeAction);
+    public const string ToastCalendarSnoozeDurationInputId = nameof(ToastCalendarSnoozeDurationInputId);
+    public const string ToastCalendarSnoozeDurationMinutesKey = nameof(ToastCalendarSnoozeDurationMinutesKey);
     public const string ToastModeKey = nameof(ToastModeKey);
     public const string ToastModeMail = nameof(ToastModeMail);
     public const string ToastModeCalendar = nameof(ToastModeCalendar);
-
+    public const string ToastStoreUpdateActionKey = nameof(ToastStoreUpdateActionKey);
+    public const string ToastStoreUpdateActionInstall = nameof(ToastStoreUpdateActionInstall);
     public const string ClientLogFile = "Client_.log";
     public const string ServerLogFile = "Server_.log";
     public const string LogArchiveFileName = "WinoLogs.zip";
@@ -27,3 +34,4 @@ public static class Constants
     public const string WinoMailIdentiifer = nameof(WinoMailIdentiifer);
     public const string WinoCalendarIdentifier = nameof(WinoCalendarIdentifier);
 }
+

Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs

@@ -25,6 +25,7 @@ public class AccountCalendar : IAccountCalendar
     /// </summary>
     public string TextColorHex { get; set; }
     public string BackgroundColorHex { get; set; }
+    public bool IsBackgroundColorUserOverridden { get; set; }
     public string TimeZone { get; set; }
 
     [Ignore]

Wino.Core.Domain/Entities/Calendar/CalendarEventAttendee.cs

@@ -1,10 +1,10 @@
 using System;
 using SQLite;
+using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Enums;
 
 namespace Wino.Core.Domain.Entities.Calendar;
 
-// TODO: Connect to Contact store with Wino People.
 public class CalendarEventAttendee
 {
     [PrimaryKey]
@@ -16,4 +16,11 @@ public class CalendarEventAttendee
     public bool IsOrganizer { get; set; }
     public bool IsOptionalAttendee { get; set; }
     public string Comment { get; set; }
+
+    /// <summary>
+    /// Resolved contact from the contact store. Populated at runtime via IContactService;
+    /// not persisted to the database.
+    /// </summary>
+    [Ignore]
+    public AccountContact ResolvedContact { get; set; }
 }

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

@@ -138,6 +138,7 @@ public class CalendarItem : ICalendarItem
     // TODO
     public string CustomEventColorHex { get; set; }
     public string HtmlLink { get; set; }
+    public DateTime? SnoozedUntil { get; set; }
     public CalendarItemStatus Status { get; set; }
     public CalendarItemVisibility Visibility { get; set; }
 
@@ -153,6 +154,24 @@ public class CalendarItem : ICalendarItem
     [Ignore]
     public IAccountCalendar AssignedCalendar { get; set; }
 
+    [Ignore]
+    public bool CanChangeStartAndEndDate
+    {
+        get
+        {
+            if (IsLocked)
+            {
+                return false;
+            }
+
+            var accountAddress = AssignedCalendar?.MailAccount?.Address;
+
+            return string.IsNullOrWhiteSpace(OrganizerEmail) ||
+                   string.IsNullOrWhiteSpace(accountAddress) ||
+                   string.Equals(OrganizerEmail, accountAddress, StringComparison.OrdinalIgnoreCase);
+        }
+    }
+
     /// <summary>
     /// Id to load information related to this event (attendees, reminders, etc.).
     /// For child events, if they have their own data, use their own Id.

Wino.Core.Domain/Entities/Mail/EmailTemplate.cs

@@ -0,0 +1,16 @@
+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Mail;
+
+public class EmailTemplate
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    public string Description { get; set; } = string.Empty;
+
+    public string HtmlContent { get; set; } = string.Empty;
+}

Wino.Core.Domain/Entities/Mail/MailAccountAlias.cs

@@ -2,6 +2,8 @@
 using System.Collections.ObjectModel;
 using System.Security.Cryptography.X509Certificates;
 using SQLite;
+using Wino.Core.Domain;
+using Wino.Core.Domain.Enums;
 
 namespace Wino.Core.Domain.Entities.Mail;
 
@@ -42,6 +44,16 @@ public class RemoteAccountAlias
     /// Used for Gmail only.
     /// </summary>
     public string AliasSenderName { get; set; }
+
+    /// <summary>
+    /// Whether the alias was entered by the user or discovered from the provider.
+    /// </summary>
+    public AliasSource Source { get; set; } = AliasSource.Manual;
+
+    /// <summary>
+    /// Represents Wino's confidence that the alias can be used for sending.
+    /// </summary>
+    public AliasSendCapability SendCapability { get; set; } = AliasSendCapability.Unknown;
 }
 
 public class MailAccountAlias : RemoteAccountAlias
@@ -70,4 +82,28 @@ public class MailAccountAlias : RemoteAccountAlias
 
     [Ignore]
     public ObservableCollection<X509Certificate2> Certificates { get; set; } = [];
+
+    [Ignore]
+    public bool IsCapabilityConfirmed => SendCapability == AliasSendCapability.Confirmed;
+
+    [Ignore]
+    public bool IsCapabilityUnknown => SendCapability == AliasSendCapability.Unknown;
+
+    [Ignore]
+    public bool IsCapabilityDenied => SendCapability == AliasSendCapability.Denied;
+
+    [Ignore]
+    public string CapabilityDisplayName => SendCapability switch
+    {
+        AliasSendCapability.Confirmed => Translator.AccountAlias_Status_Confirmed,
+        AliasSendCapability.Denied => Translator.AccountAlias_Status_Denied,
+        _ => Translator.AccountAlias_Status_Unknown
+    };
+
+    [Ignore]
+    public string SourceDisplayName => Source switch
+    {
+        AliasSource.ProviderDiscovered => Translator.AccountAlias_Source_ProviderDiscovered,
+        _ => Translator.AccountAlias_Source_Manual
+    };
 }

Wino.Core.Domain/Entities/Mail/MailCopy.cs

@@ -155,6 +155,18 @@ public class MailCopy
     [Ignore]
     public AccountContact SenderContact { get; set; }
 
+    [Ignore]
+    public bool IsReadReceiptRequested { get; set; }
+
+    [Ignore]
+    public SentMailReceiptStatus ReadReceiptStatus { get; set; }
+
+    [Ignore]
+    public DateTime? ReadReceiptAcknowledgedAtUtc { get; set; }
+
+    [Ignore]
+    public Guid? ReadReceiptMessageUniqueId { get; set; }
+
     public IEnumerable<Guid> GetContainingIds() => [UniqueId];
     public override string ToString() => $"{Subject} <-> {Id}";
 }

Wino.Core.Domain/Entities/Mail/SentMailReceiptState.cs

@@ -0,0 +1,25 @@
+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Mail;
+
+public class SentMailReceiptState
+{
+    [PrimaryKey]
+    public Guid MailUniqueId { get; set; }
+
+    public Guid AccountId { get; set; }
+
+    public string MessageId { get; set; }
+
+    public bool IsReceiptRequested { get; set; }
+
+    public DateTime RequestedAtUtc { get; set; }
+
+    public SentMailReceiptStatus Status { get; set; }
+
+    public DateTime? AcknowledgedAtUtc { get; set; }
+
+    public Guid? ReceiptMessageUniqueId { get; set; }
+}

Wino.Core.Domain/Entities/Shared/AccountContact.cs

@@ -11,7 +11,7 @@ namespace Wino.Core.Domain.Entities.Shared;
 
 // TODO: This can easily evolve to Contact store, just like People app in Windows 10/11.
 // Do it.
-public class AccountContact : IEquatable<AccountContact>
+public class AccountContact : IEquatable<AccountContact>, IContactDisplayItem
 {
     /// <summary>
     /// E-mail address of the contact.
@@ -25,9 +25,10 @@ public class AccountContact : IEquatable<AccountContact>
     public string Name { get; set; }
 
     /// <summary>
-    /// Base64 encoded profile image of the contact.
+    /// File ID for the contact picture stored on disk.
+    /// The actual file lives at {ApplicationDataFolderPath}/contacts/{ContactPictureFileId}.jpg.
     /// </summary>
-    public string Base64ContactPicture { get; set; }
+    public Guid? ContactPictureFileId { get; set; }
 
     /// <summary>
     /// All registered accounts have their contacts registered as root.
@@ -42,6 +43,9 @@ public class AccountContact : IEquatable<AccountContact>
     /// </summary>
     public bool IsOverridden { get; set; } = false;
 
+    public string DisplayName => string.IsNullOrWhiteSpace(Name) ? Address : Name;
+    AccountContact IContactDisplayItem.PreviewContact => this;
+
     public override bool Equals(object obj)
     {
         return Equals(obj as AccountContact);

Wino.Core.Domain/Entities/Shared/ContactGroup.cs

@@ -0,0 +1,19 @@
+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Shared;
+
+/// <summary>
+/// A named group of contacts that can be expanded to individual addresses during mail composition.
+/// </summary>
+public class ContactGroup
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+
+    /// <summary>Display name of the group (e.g., "Team Alpha", "Family").</summary>
+    public string Name { get; set; }
+
+    /// <summary>Optional description for the group.</summary>
+    public string Description { get; set; }
+}

Wino.Core.Domain/Entities/Shared/ContactGroupMember.cs

@@ -0,0 +1,21 @@
+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Shared;
+
+/// <summary>
+/// Associates an e-mail address with a <see cref="ContactGroup"/>.
+/// </summary>
+public class ContactGroupMember
+{
+    [PrimaryKey, AutoIncrement]
+    public int Id { get; set; }
+
+    /// <summary>Group this member belongs to.</summary>
+    [Indexed]
+    public Guid GroupId { get; set; }
+
+    /// <summary>E-mail address of the member (FK to AccountContact.Address).</summary>
+    [Indexed]
+    public string MemberAddress { get; set; }
+}

Wino.Core.Domain/Entities/Shared/IContactDisplayItem.cs

@@ -0,0 +1,8 @@
+namespace Wino.Core.Domain.Entities.Shared;
+
+public interface IContactDisplayItem
+{
+    string DisplayName { get; }
+    string Address { get; }
+    AccountContact PreviewContact { get; }
+}

Wino.Core.Domain/Entities/Shared/KeyboardShortcut.cs

@@ -12,6 +12,11 @@ public class KeyboardShortcut
     [PrimaryKey]
     public Guid Id { get; set; }
 
+    /// <summary>
+    /// The application mode this shortcut applies to.
+    /// </summary>
+    public WinoApplicationMode Mode { get; set; } = WinoApplicationMode.Mail;
+
     /// <summary>
     /// The key combination string (e.g., "D", "Delete", "F1").
     /// </summary>
@@ -23,9 +28,9 @@ public class KeyboardShortcut
     public ModifierKeys ModifierKeys { get; set; }
 
     /// <summary>
-    /// The mail operation this shortcut triggers.
+    /// The shortcut action this shortcut triggers.
     /// </summary>
-    public MailOperation MailOperation { get; set; }
+    public KeyboardShortcutAction Action { get; set; }
 
     /// <summary>
     /// Whether this shortcut is enabled.

Wino.Core.Domain/Entities/Shared/MailAccount.cs

@@ -112,6 +112,16 @@ public class MailAccount
     /// </summary>
     public DateTime? LastFolderStructureSyncDate { get; set; }
 
+    /// <summary>
+    /// Gets or sets when the account was created in Wino.
+    /// </summary>
+    public DateTime? CreatedAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the timespan used for the account's initial mail synchronization.
+    /// </summary>
+    public InitialSynchronizationRange InitialSynchronizationRange { get; set; } = InitialSynchronizationRange.SixMonths;
+
     /// <summary>
     /// Gets whether the account can perform ProfileInformation sync type.
     /// </summary>
@@ -120,7 +130,7 @@ public class MailAccount
     /// <summary>
     /// Gets whether the account can perform AliasInformation sync type.
     /// </summary>
-    public bool IsAliasSyncSupported => ProviderType == MailProviderType.Gmail;
+    public bool IsAliasSyncSupported => ProviderType == MailProviderType.Gmail || ProviderType == MailProviderType.Outlook;
 
     public override string ToString() => Name;
 }

Wino.Core.Domain/Entities/Shared/WinoAccount.cs

@@ -0,0 +1,30 @@
+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Shared;
+
+public class WinoAccount
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+
+    public string Email { get; set; } = string.Empty;
+
+    public string AccountStatus { get; set; } = string.Empty;
+
+    public bool HasPassword { get; set; }
+
+    public bool HasGoogleLogin { get; set; }
+
+    public bool HasFacebookLogin { get; set; }
+
+    public string AccessToken { get; set; } = string.Empty;
+
+    public DateTime AccessTokenExpiresAtUtc { get; set; }
+
+    public string RefreshToken { get; set; } = string.Empty;
+
+    public DateTime RefreshTokenExpiresAtUtc { get; set; }
+
+    public DateTime LastAuthenticatedUtc { get; set; }
+}

Wino.Core.Domain/Enums/AccountSetupStepStatus.cs

@@ -0,0 +1,9 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum AccountSetupStepStatus
+{
+    Pending,
+    InProgress,
+    Succeeded,
+    Failed
+}

Wino.Core.Domain/Enums/AiActionType.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Wino.Core.Domain.Enums;
+
+[Flags]
+public enum AiActionType
+{
+    None = 0,
+    Translate = 1,
+    Rewrite = 2,
+    Summarize = 4,
+}

Wino.Core.Domain/Enums/AliasSendCapability.cs

@@ -0,0 +1,8 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum AliasSendCapability
+{
+    Unknown = 0,
+    Confirmed = 1,
+    Denied = 2
+}

Wino.Core.Domain/Enums/AliasSource.cs

@@ -0,0 +1,7 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum AliasSource
+{
+    Manual = 0,
+    ProviderDiscovered = 1
+}

Wino.Core.Domain/Enums/CalendarContextMenuActionType.cs

@@ -0,0 +1,10 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum CalendarContextMenuActionType
+{
+    Open,
+    JoinOnline,
+    Delete,
+    ShowAs,
+    Respond
+}

Wino.Core.Domain/Enums/CalendarInitInitiative.cs

@@ -1,10 +0,0 @@
-namespace Wino.Core.Domain.Enums;
-
-/// <summary>
-/// Trigger to load more data.
-/// </summary>
-public enum CalendarInitInitiative
-{
-    User,
-    App
-}

Wino.Core.Domain/Enums/CalendarSynchronizationType.cs

@@ -5,6 +5,7 @@ public enum CalendarSynchronizationType
     ExecuteRequests, // Execute all requests in the queue.
     CalendarMetadata, // Sync calendar metadata.
     CalendarEvents, // Sync all events for all calendars.
+    Strict, // Run metadata and event synchronization in sequence.
     SingleCalendar, // Sync events for only specified calendars.
     UpdateProfile // Update profile information only.
 }

Wino.Core.Domain/Enums/EntityUpdateSource.cs

@@ -1,17 +1,17 @@
 namespace Wino.Core.Domain.Enums;
 
 /// <summary>
-/// Indicates the source of a calendar item update.
+/// Indicates the source of an entity update.
 /// </summary>
-public enum CalendarItemUpdateSource
+public enum EntityUpdateSource
 {
     /// <summary>
-    /// Update originated from client-side UI changes (ApplyUIChanges).
+    /// Update originated from client-side optimistic UI changes (ApplyUIChanges).
     /// </summary>
     ClientUpdated,
 
     /// <summary>
-    /// Update originated from client-side UI revert (RevertUIChanges).
+    /// Update originated from reverting client-side optimistic UI changes (RevertUIChanges).
     /// </summary>
     ClientReverted,
 

Wino.Core.Domain/Enums/InitialSynchronizationRange.cs

@@ -0,0 +1,10 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum InitialSynchronizationRange
+{
+    SixMonths = 0,
+    ThreeMonths = 1,
+    NineMonths = 2,
+    OneYear = 3,
+    Everything = 4
+}

Wino.Core.Domain/Enums/KeyboardShortcutAction.cs

@@ -0,0 +1,16 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum KeyboardShortcutAction
+{
+    None,
+    NewMail,
+    ToggleReadUnread,
+    ToggleFlag,
+    ToggleArchive,
+    Delete,
+    Move,
+    Reply,
+    ReplyAll,
+    Send,
+    NewEvent
+}

Wino.Core.Domain/Enums/MailCopyChangeFlags.cs

@@ -0,0 +1,59 @@
+using System;
+
+namespace Wino.Core.Domain.Enums;
+
+[Flags]
+public enum MailCopyChangeFlags
+{
+    None = 0,
+    Id = 1 << 0,
+    FolderId = 1 << 1,
+    ThreadId = 1 << 2,
+    MessageId = 1 << 3,
+    References = 1 << 4,
+    InReplyTo = 1 << 5,
+    FromName = 1 << 6,
+    FromAddress = 1 << 7,
+    Subject = 1 << 8,
+    PreviewText = 1 << 9,
+    CreationDate = 1 << 10,
+    Importance = 1 << 11,
+    IsRead = 1 << 12,
+    IsFlagged = 1 << 13,
+    IsFocused = 1 << 14,
+    HasAttachments = 1 << 15,
+    ItemType = 1 << 16,
+    DraftId = 1 << 17,
+    IsDraft = 1 << 18,
+    FileId = 1 << 19,
+    AssignedFolder = 1 << 20,
+    AssignedAccount = 1 << 21,
+    SenderContact = 1 << 22,
+    UniqueId = 1 << 23,
+    ReadReceiptState = 1 << 24,
+    All = Id |
+          FolderId |
+          ThreadId |
+          MessageId |
+          References |
+          InReplyTo |
+          FromName |
+          FromAddress |
+          Subject |
+          PreviewText |
+          CreationDate |
+          Importance |
+          IsRead |
+          IsFlagged |
+          IsFocused |
+          HasAttachments |
+          ItemType |
+          DraftId |
+          IsDraft |
+          FileId |
+          AssignedFolder |
+          AssignedAccount |
+          SenderContact |
+          UniqueId |
+          ReadReceiptState
+}

Wino.Core.Domain/Enums/MailOperation.cs

@@ -9,6 +9,7 @@ public enum MailSynchronizerOperation
     CreateDraft,
     Send,
     ChangeFlag,
+    ChangeJunkState,
     AlwaysMoveTo,
     MoveToFocused,
     Archive,
@@ -27,6 +28,7 @@ public enum CalendarSynchronizerOperation
 {
     CreateEvent,
     UpdateEvent,
+    ChangeStartAndEndDate,
     DeleteEvent,
     AcceptEvent,
     DeclineEvent,

Wino.Core.Domain/Enums/MailUpdateSource.cs

@@ -1,22 +0,0 @@
-namespace Wino.Core.Domain.Enums;
-
-/// <summary>
-/// Indicates the source of a mail update.
-/// </summary>
-public enum MailUpdateSource
-{
-    /// <summary>
-    /// Update originated from client-side UI changes (ApplyUIChanges).
-    /// </summary>
-    ClientUpdated,
-
-    /// <summary>
-    /// Update originated from client-side UI revert (RevertUIChanges).
-    /// </summary>
-    ClientReverted,
-
-    /// <summary>
-    /// Update originated from server synchronization or database operations.
-    /// </summary>
-    Server
-}

Wino.Core.Domain/Enums/NewEventButtonBehavior.cs

@@ -0,0 +1,7 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum NewEventButtonBehavior
+{
+    AskEachTime = 0,
+    AlwaysUseSpecificCalendar = 1
+}

Wino.Core.Domain/Enums/SentMailReceiptStatus.cs

@@ -0,0 +1,9 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum SentMailReceiptStatus
+{
+    None = 0,
+    Requested = 1,
+    Acknowledged = 2,
+    FailedToCorrelate = 3
+}

Wino.Core.Domain/Enums/SynchronizationProgressCategory.cs

@@ -0,0 +1,7 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum SynchronizationProgressCategory
+{
+    Mail,
+    Calendar
+}

Wino.Core.Domain/Enums/WinoAddOnProductType.cs

@@ -0,0 +1,7 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum WinoAddOnProductType
+{
+    AI_PACK,
+    UNLIMITED_ACCOUNTS
+}

Wino.Core.Domain/Enums/WinoApplicationMode.cs

@@ -3,5 +3,7 @@
 public enum WinoApplicationMode
 {
     Mail,
-    Calendar
+    Calendar,
+    Contacts,
+    Settings
 }

Wino.Core.Domain/Enums/WinoPage.cs

@@ -11,7 +11,6 @@ public enum WinoPage
     SettingsPage,
     ContactsPage,
     MailRenderingPage,
-    WelcomePage,
     AccountDetailsPage,
     MergedAccountDetailsPage,
     ManageAccountsPage,
@@ -22,17 +21,27 @@ public enum WinoPage
     MessageListPage,
     MailListPage,
     ReadComposePanePage,
-    LanguageTimePage,
     AppPreferencesPage,
     SettingOptionsPage,
     AliasManagementPage,
-    EditAccountDetailsPage,
     ImapCalDavSettingsPage,
     KeyboardShortcutsPage,
     CalendarPage,
     CalendarSettingsPage,
+    CalendarRenderingSettingsPage,
+    CalendarNotificationSettingsPage,
+    CalendarPreferenceSettingsPage,
     CalendarAccountSettingsPage,
     EventDetailsPage,
+    CalendarEventComposePage,
     SignatureAndEncryptionPage,
-    StoragePage
+    EmailTemplatesPage,
+    CreateEmailTemplatePage,
+    StoragePage,
+    WinoAccountManagementPage,
+    WelcomePageV2,
+    WelcomeHostPage,
+    ProviderSelectionPage,
+    AccountSetupProgressPage,
+    SpecialImapCredentialsPage
 }

Wino.Core.Domain/Exceptions/CalendarEventComposeValidationException.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Wino.Core.Domain.Exceptions;
+
+public sealed class CalendarEventComposeValidationException : Exception
+{
+    public CalendarEventComposeValidationException(string message) : base(message)
+    {
+    }
+}

Wino.Core.Domain/Exceptions/ImapClientPoolException.cs

@@ -9,22 +9,18 @@ public class ImapClientPoolException : Exception
     {
     }
 
-    public ImapClientPoolException(string message, CustomServerInformation customServerInformation, string protocolLog) : base(message)
+    public ImapClientPoolException(string message, CustomServerInformation customServerInformation) : base(message)
     {
         CustomServerInformation = customServerInformation;
-        ProtocolLog = protocolLog;
     }
 
-    public ImapClientPoolException(string message, string protocolLog) : base(message)
+    public ImapClientPoolException(string message) : base(message)
     {
-        ProtocolLog = protocolLog;
     }
 
-    public ImapClientPoolException(Exception innerException, string protocolLog) : base(innerException.Message, innerException)
+    public ImapClientPoolException(Exception innerException) : base(innerException.Message, innerException)
     {
-        ProtocolLog = protocolLog;
     }
 
     public CustomServerInformation CustomServerInformation { get; }
-    public string ProtocolLog { get; }
 }

Wino.Core.Domain/Exceptions/ImapConnectionFailedPackage.cs

@@ -1,17 +0,0 @@
-using Wino.Core.Domain.Models.AutoDiscovery;
-
-namespace Wino.Core.Domain.Exceptions;
-
-public class ImapConnectionFailedPackage
-{
-    public ImapConnectionFailedPackage(string errorMessage, string protocolLog, AutoDiscoverySettings settings)
-    {
-        ErrorMessage = errorMessage;
-        ProtocolLog = protocolLog;
-        Settings = settings;
-    }
-
-    public AutoDiscoverySettings Settings { get; }
-    public string ErrorMessage { get; set; }
-    public string ProtocolLog { get; }
-}

Wino.Core.Domain/Extensions/CalendarRemoteEventIdExtensions.cs

@@ -0,0 +1,67 @@
+using System;
+
+namespace Wino.Core.Domain.Extensions;
+
+public static class CalendarRemoteEventIdExtensions
+{
+    private const string ClientTrackingSeparator = "::";
+    private const string CalDavClientTrackingPrefix = "caldav-";
+    private const string LocalClientTrackingPrefix = "local-";
+
+    public static string GetProviderRemoteEventId(this string remoteEventId)
+    {
+        if (string.IsNullOrWhiteSpace(remoteEventId))
+            return string.Empty;
+
+        var separatorIndex = remoteEventId.IndexOf(ClientTrackingSeparator, StringComparison.Ordinal);
+        return separatorIndex >= 0 ? remoteEventId[..separatorIndex] : remoteEventId;
+    }
+
+    public static Guid? GetClientTrackingId(this string remoteEventId)
+    {
+        if (string.IsNullOrWhiteSpace(remoteEventId))
+            return null;
+
+        if (remoteEventId.Contains(ClientTrackingSeparator, StringComparison.Ordinal))
+        {
+            var trackedPart = remoteEventId[(remoteEventId.LastIndexOf(ClientTrackingSeparator, StringComparison.Ordinal) + ClientTrackingSeparator.Length)..];
+            if (TryParseGuid(trackedPart, out var trackedId))
+                return trackedId;
+        }
+
+        if (TryParseGuid(remoteEventId, out var directId))
+            return directId;
+
+        if (remoteEventId.StartsWith(CalDavClientTrackingPrefix, StringComparison.OrdinalIgnoreCase) &&
+            TryParseGuid(remoteEventId[CalDavClientTrackingPrefix.Length..], out var calDavId))
+        {
+            return calDavId;
+        }
+
+        if (remoteEventId.StartsWith(LocalClientTrackingPrefix, StringComparison.OrdinalIgnoreCase) &&
+            TryParseGuid(remoteEventId[LocalClientTrackingPrefix.Length..], out var localId))
+        {
+            return localId;
+        }
+
+        return null;
+    }
+
+    public static string WithClientTrackingId(this string providerRemoteEventId, Guid? clientTrackingId)
+    {
+        if (string.IsNullOrWhiteSpace(providerRemoteEventId) || !clientTrackingId.HasValue)
+            return providerRemoteEventId ?? string.Empty;
+
+        return $"{providerRemoteEventId}{ClientTrackingSeparator}{clientTrackingId.Value:N}";
+    }
+
+    private static bool TryParseGuid(string value, out Guid parsedGuid)
+    {
+        parsedGuid = Guid.Empty;
+
+        if (string.IsNullOrWhiteSpace(value))
+            return false;
+
+        return Guid.TryParseExact(value, "N", out parsedGuid) || Guid.TryParse(value, out parsedGuid);
+    }
+}

Wino.Core.Domain/Extensions/DateTimeExtensions.cs

@@ -78,8 +78,12 @@ public static class DateTimeExtensions
     }
 
     public static DateTime GetLocalStartDate(this CalendarItem calendarItem)
-        => calendarItem.StartDate.ToLocalTimeFromTimeZone(calendarItem.StartTimeZone);
+        => calendarItem.IsAllDayEvent
+            ? calendarItem.StartDate
+            : calendarItem.StartDate.ToLocalTimeFromTimeZone(calendarItem.StartTimeZone);
 
     public static DateTime GetLocalEndDate(this CalendarItem calendarItem)
-        => calendarItem.EndDate.ToLocalTimeFromTimeZone(calendarItem.EndTimeZone);
+        => calendarItem.IsAllDayEvent
+            ? calendarItem.EndDate
+            : calendarItem.EndDate.ToLocalTimeFromTimeZone(calendarItem.EndTimeZone);
 }

Wino.Core.Domain/Extensions/InitialSynchronizationRangeExtensions.cs

@@ -0,0 +1,23 @@
+using System;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Extensions;
+
+public static class InitialSynchronizationRangeExtensions
+{
+    public static DateTime? ToCutoffDateUtc(this InitialSynchronizationRange range, DateTime utcNow)
+    {
+        var normalizedUtcNow = utcNow.Kind == DateTimeKind.Utc
+            ? utcNow
+            : utcNow.ToUniversalTime();
+
+        return range switch
+        {
+            InitialSynchronizationRange.ThreeMonths => normalizedUtcNow.AddMonths(-3),
+            InitialSynchronizationRange.SixMonths => normalizedUtcNow.AddMonths(-6),
+            InitialSynchronizationRange.NineMonths => normalizedUtcNow.AddMonths(-9),
+            InitialSynchronizationRange.OneYear => normalizedUtcNow.AddYears(-1),
+            _ => null
+        };
+    }
+}

Wino.Core.Domain/Extensions/MailHeaderExtensions.cs

@@ -1,10 +1,26 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 
 namespace Wino.Core.Domain.Extensions;
 
 public static class MailHeaderExtensions
 {
+    public static string NormalizeMessageId(string value)
+    {
+        if (value == null)
+            return null;
+
+        var normalized = StripAngleBrackets(value)?.Trim();
+        return string.IsNullOrWhiteSpace(normalized) ? string.Empty : normalized;
+    }
+
+    public static string ToHeaderMessageId(string value)
+    {
+        var normalized = NormalizeMessageId(value);
+        return string.IsNullOrEmpty(normalized) ? string.Empty : $"<{normalized}>";
+    }
+
     /// <summary>
     /// Strips angle brackets from a Message-ID or In-Reply-To value.
     /// RFC 5322 Message-IDs are formatted as &lt;id@domain&gt;, but MimeKit
@@ -29,14 +45,53 @@ public static class MailHeaderExtensions
     /// like "&lt;id1@domain&gt; &lt;id2@domain&gt;". This converts them to "id1@domain;id2@domain".
     /// </summary>
     public static string NormalizeReferences(string rawReferences)
+        => JoinStoredReferences(SplitMessageIds(rawReferences));
+
+    public static IEnumerable<string> SplitMessageIds(string values)
     {
-        if (string.IsNullOrEmpty(rawReferences)) return rawReferences;
+        if (string.IsNullOrWhiteSpace(values))
+            return [];
 
-        var ids = rawReferences
+        return values
             .Split(new[] { ' ', '\t', '\r', '\n', ';', ',' }, StringSplitOptions.RemoveEmptyEntries)
-            .Select(StripAngleBrackets)
+            .Select(NormalizeMessageId)
             .Where(id => !string.IsNullOrEmpty(id));
+    }
 
-        return string.Join(";", ids);
+    public static string JoinStoredReferences(IEnumerable<string> values)
+        => string.Join(";", NormalizeDistinctMessageIds(values));
+
+    public static string BuildReferencesHeaderValue(IEnumerable<string> values)
+        => string.Join(" ", NormalizeDistinctMessageIds(values).Select(ToHeaderMessageId));
+
+    public static List<string> BuildReferencesChain(IEnumerable<string> existingReferences, string parentMessageId)
+    {
+        var results = NormalizeDistinctMessageIds(existingReferences).ToList();
+        var normalizedParentMessageId = NormalizeMessageId(parentMessageId);
+
+        if (!string.IsNullOrEmpty(normalizedParentMessageId) &&
+            !results.Contains(normalizedParentMessageId, StringComparer.OrdinalIgnoreCase))
+        {
+            results.Add(normalizedParentMessageId);
+        }
+
+        return results;
+    }
+
+    private static IEnumerable<string> NormalizeDistinctMessageIds(IEnumerable<string> values)
+    {
+        if (values == null)
+            yield break;
+
+        var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+
+        foreach (var value in values)
+        {
+            var normalized = NormalizeMessageId(value);
+            if (string.IsNullOrEmpty(normalized) || !seen.Add(normalized))
+                continue;
+
+            yield return normalized;
+        }
     }
 }

Wino.Core.Domain/Extensions/ReadReceiptExtensions.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using MimeKit;
+
+namespace Wino.Core.Domain.Extensions;
+
+public static class ReadReceiptExtensions
+{
+    public static bool HasReadReceiptRequest(this MimeMessage mimeMessage)
+        => mimeMessage?.Headers?.Contains(Constants.DispositionNotificationToHeader) == true
+           && !string.IsNullOrWhiteSpace(mimeMessage.Headers[Constants.DispositionNotificationToHeader]);
+
+    public static void SetReadReceiptRequest(this MimeMessage mimeMessage, string address, bool isRequested)
+    {
+        if (mimeMessage == null)
+            return;
+
+        mimeMessage.Headers.Remove(Constants.DispositionNotificationToHeader);
+
+        if (isRequested && !string.IsNullOrWhiteSpace(address))
+        {
+            mimeMessage.Headers.Add(Constants.DispositionNotificationToHeader, address.Trim());
+        }
+    }
+
+    public static bool LooksLikeReadReceipt(this MimeMessage mimeMessage)
+    {
+        if (mimeMessage?.Body == null)
+            return false;
+
+        return mimeMessage.BodyParts.Any(IsReadReceiptEntity) || IsReadReceiptEntity(mimeMessage.Body);
+    }
+
+    public static ReadReceiptParseResult ParseReadReceipt(this MimeMessage mimeMessage)
+    {
+        if (!mimeMessage.LooksLikeReadReceipt())
+            return ReadReceiptParseResult.Empty;
+
+        var entity = mimeMessage.BodyParts.FirstOrDefault(IsReadReceiptEntity) ?? mimeMessage.Body;
+        var lines = ReadEntityLines(entity);
+
+        string originalMessageId = null;
+
+        foreach (var line in lines)
+        {
+            if (line.StartsWith(Constants.OriginalMessageIdHeader + ":", StringComparison.OrdinalIgnoreCase))
+            {
+                originalMessageId = line.Substring(line.IndexOf(':') + 1).Trim();
+                break;
+            }
+        }
+
+        var acknowledgedAtUtc = mimeMessage.Date != DateTimeOffset.MinValue
+            ? mimeMessage.Date.UtcDateTime
+            : (DateTime?)null;
+
+        return new ReadReceiptParseResult(
+            true,
+            MailHeaderExtensions.NormalizeMessageId(originalMessageId),
+            acknowledgedAtUtc);
+    }
+
+    private static bool IsReadReceiptEntity(MimeEntity entity)
+    {
+        if (entity?.ContentType == null)
+            return false;
+
+        if (entity.ContentType.MimeType.Equals("message/disposition-notification", StringComparison.OrdinalIgnoreCase))
+            return true;
+
+        var reportType = entity.ContentType.Parameters["report-type"];
+        return entity.ContentType.MimeType.Equals("multipart/report", StringComparison.OrdinalIgnoreCase)
+               && !string.IsNullOrWhiteSpace(reportType)
+               && reportType.Equals("disposition-notification", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static IEnumerable<string> ReadEntityLines(MimeEntity entity)
+    {
+        if (entity is TextPart textPart)
+        {
+            return SplitLines(textPart.Text);
+        }
+
+        if (entity is MimePart mimePart)
+        {
+            using var memoryStream = new MemoryStream();
+            mimePart.Content?.DecodeTo(memoryStream);
+            memoryStream.Position = 0;
+            using var reader = new StreamReader(memoryStream);
+            return SplitLines(reader.ReadToEnd());
+        }
+
+        using var serializedStream = new MemoryStream();
+        entity.WriteTo(serializedStream);
+        serializedStream.Position = 0;
+        using var serializedReader = new StreamReader(serializedStream);
+        return SplitLines(serializedReader.ReadToEnd());
+    }
+
+    private static IEnumerable<string> SplitLines(string content)
+        => string.IsNullOrWhiteSpace(content)
+            ? []
+            : content.Split(["\r\n", "\n"], StringSplitOptions.RemoveEmptyEntries);
+}
+
+public sealed record ReadReceiptParseResult(bool IsReadReceipt, string OriginalMessageId, DateTime? AcknowledgedAtUtc)
+{
+    public static ReadReceiptParseResult Empty { get; } = new(false, string.Empty, null);
+}

Wino.Core.Domain/Interfaces/IAccountMenuItem.cs

@@ -1,18 +1,25 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Models.Synchronization;
 
 namespace Wino.Core.Domain.Interfaces;
 
 public interface IAccountMenuItem : IMenuItem
 {
     bool IsEnabled { get; set; }
+    bool IsSynchronizationInProgress { get; set; }
 
     /// <summary>
-    /// Calculated synchronization progress percentage (0-100). -1 for indeterminate.
+    /// Calculated synchronization progress percentage (0-100).
     /// </summary>
     double SynchronizationProgress { get; }
 
+    /// <summary>
+    /// Progress value clamped for XAML progress controls.
+    /// </summary>
+    double SynchronizationProgressValue { get; }
+
     /// <summary>
     /// Total items to sync. 0 for indeterminate progress.
     /// </summary>
@@ -30,6 +37,7 @@ public interface IAccountMenuItem : IMenuItem
 
     int UnreadItemCount { get; set; }
     IEnumerable<MailAccount> HoldingAccounts { get; }
+    void ApplySynchronizationProgress(AccountSynchronizationProgress progress);
     void UpdateAccount(MailAccount account);
 }
 

Wino.Core.Domain/Interfaces/IAccountService.cs

@@ -147,6 +147,7 @@ public interface IAccountService
     /// <param name="accountId">Account id.</param>
     /// <returns>Primary alias for the account.</returns>
     Task<MailAccountAlias> GetPrimaryAccountAliasAsync(Guid accountId);
+    Task UpdateAliasSendCapabilityAsync(Guid accountId, string aliasAddress, AliasSendCapability capability);
     Task<bool> IsAccountFocusedEnabledAsync(Guid accountId);
 
     /// <summary>

Wino.Core.Domain/Interfaces/IAiActionOptionsService.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+using Wino.Core.Domain.Models.Ai;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IAiActionOptionsService
+{
+    IReadOnlyList<AiTranslateLanguageOption> GetTranslateLanguageOptions();
+    IReadOnlyList<AiRewriteModeOption> GetRewriteModeOptions();
+}

Wino.Core.Domain/Interfaces/IBaseSynchronizer.cs

@@ -1,4 +1,5 @@
-using System;
+using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Enums;
@@ -30,12 +31,22 @@ public interface IBaseSynchronizer
     /// <param name="mailUniqueId">Mail unique id to check.</param>
     bool HasPendingOperation(Guid mailUniqueId);
 
+    /// <summary>
+    /// Returns mail unique ids that currently have queued or executing operations.
+    /// </summary>
+    IReadOnlyCollection<Guid> GetPendingOperationUniqueIds();
+
     /// <summary>
     /// Returns whether there is an in-progress (queued or currently executing) operation for the given calendar item id.
     /// </summary>
     /// <param name="calendarItemId">Calendar item id to check.</param>
     bool HasPendingCalendarOperation(Guid calendarItemId);
 
+    /// <summary>
+    /// Returns calendar item ids that currently have queued or executing operations.
+    /// </summary>
+    IReadOnlyCollection<Guid> GetPendingCalendarOperationIds();
+
     /// <summary>
     /// Synchronizes profile information with the server.
     /// Sender name and Profile picture are updated.

Wino.Core.Domain/Interfaces/ICalendarContextMenuItemService.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface ICalendarContextMenuItemService
+{
+    IReadOnlyList<CalendarContextMenuItem> GetContextMenuItems(CalendarItem calendarItem);
+}

Wino.Core.Domain/Interfaces/ICalendarService.cs

@@ -18,6 +18,7 @@ public interface ICalendarService
     Task DeleteAccountCalendarAsync(AccountCalendar accountCalendar);
     Task InsertAccountCalendarAsync(AccountCalendar accountCalendar);
     Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar);
+    Task SetPrimaryCalendarAsync(Guid accountId, Guid accountCalendarId);
     Task CreateNewCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees);
 
     /// <summary>
@@ -40,8 +41,10 @@ public interface ICalendarService
     Task<List<CalendarEventAttendee>> GetAttendeesAsync(Guid calendarEventTrackingId);
     Task<List<CalendarEventAttendee>> ManageEventAttendeesAsync(Guid calendarItemId, List<CalendarEventAttendee> allAttendees);
     Task UpdateCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees);
+    Task<List<CalendarItem>> SearchCalendarItemsAsync(string searchQuery, int limit, CancellationToken cancellationToken = default);
     Task<List<Reminder>> GetRemindersAsync(Guid calendarItemId);
     Task SaveRemindersAsync(Guid calendarItemId, List<Reminder> reminders);
+    Task SnoozeCalendarItemAsync(Guid calendarItemId, DateTime snoozedUntilLocal);
 
     /// <summary>
     /// Checks due reminder windows and returns reminder notifications that should trigger now.

Wino.Core.Domain/Interfaces/IContactPictureFileService.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Interfaces;
+
+/// <summary>
+/// Manages contact picture files stored on disk instead of as base64 in SQLite,
+/// eliminating DB bloat and enabling native WIC hardware-accelerated image loading.
+/// </summary>
+public interface IContactPictureFileService
+{
+    /// <summary>
+    /// Returns the full file path for the given file ID, or null if the file does not exist on disk.
+    /// </summary>
+    string GetContactPicturePath(Guid fileId);
+
+    /// <summary>
+    /// Saves raw image bytes to disk and returns the new file ID.
+    /// </summary>
+    Task<Guid> SaveContactPictureAsync(byte[] imageData);
+
+    /// <summary>
+    /// Deletes the picture file for the given file ID if it exists.
+    /// </summary>
+    Task DeleteContactPictureAsync(Guid fileId);
+}

Wino.Core.Domain/Interfaces/IContactService.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using MimeKit;
@@ -11,15 +12,30 @@ public interface IContactService
 {
     Task<List<AccountContact>> GetAddressInformationAsync(string queryText);
     Task<AccountContact> GetAddressInformationByAddressAsync(string address);
+    Task<List<AccountContact>> GetContactsByAddressesAsync(IEnumerable<string> addresses);
     Task SaveAddressInformationAsync(MimeMessage message);
     Task SaveAddressInformationAsync(IEnumerable<AccountContact> contacts);
     Task<AccountContact> CreateNewContactAsync(string address, string displayName);
     
-    // New methods for ContactsPage
+    // Paged contact queries for ContactsPage
     Task<List<AccountContact>> GetAllContactsAsync();
     Task<List<AccountContact>> SearchContactsAsync(string searchQuery);
     Task<PagedContactsResult> GetContactsPageAsync(int offset, int pageSize, string searchQuery = null, bool excludeRootContacts = false);
     Task<AccountContact> UpdateContactAsync(AccountContact contact);
     Task DeleteContactAsync(string address);
     Task DeleteContactsAsync(IEnumerable<string> addresses);
+
+    // Group / distribution list support
+    Task<List<ContactGroup>> GetGroupsAsync();
+    Task<ContactGroup> CreateGroupAsync(string name, string description = null);
+    Task DeleteGroupAsync(Guid groupId);
+    Task<List<AccountContact>> GetGroupMembersAsync(Guid groupId);
+    Task AddGroupMemberAsync(Guid groupId, string memberAddress);
+    Task RemoveGroupMemberAsync(Guid groupId, string memberAddress);
+
+    /// <summary>
+    /// Expands a contact group to the individual <see cref="AccountContact"/> entries of its members.
+    /// Returns an empty list if the group does not exist or has no members.
+    /// </summary>
+    Task<List<AccountContact>> ExpandGroupAsync(Guid groupId);
 }

Wino.Core.Domain/Interfaces/IDialogServiceBase.cs

@@ -1,10 +1,9 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Models.Accounts;
 using Wino.Core.Domain.Models.Common;
-using Wino.Core.Domain.Models.Printing;
 
 namespace Wino.Core.Domain.Interfaces;
 
@@ -28,6 +27,6 @@ public interface IDialogServiceBase
     Task<AccountCreationDialogResult> ShowAccountProviderSelectionDialogAsync(List<IProviderDetail> availableProviders);
     IAccountCreationDialog GetAccountCreationDialog(AccountCreationDialogResult accountCreationDialogResult);
     Task<List<SharedFile>> PickFilesAsync(params object[] typeFilters);
+    Task<List<PickedFileMetadata>> PickFilesMetadataAsync(params object[] typeFilters);
     Task<string> PickFilePathAsync(string saveFileName);
-    Task<WebView2PrintSettingsModel> ShowPrintDialogAsync(WebView2PrintSettingsModel initialSettings = null);
 }

Wino.Core.Domain/Interfaces/IEmailTemplateService.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Mail;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IEmailTemplateService
+{
+    Task<List<EmailTemplate>> GetEmailTemplatesAsync();
+    Task<EmailTemplate> GetEmailTemplateAsync(Guid templateId);
+    Task<EmailTemplate> CreateEmailTemplateAsync(EmailTemplate template);
+    Task<EmailTemplate> UpdateEmailTemplateAsync(EmailTemplate template);
+    Task<EmailTemplate> DeleteEmailTemplateAsync(EmailTemplate template);
+}

Wino.Core.Domain/Interfaces/IKeyboardShortcutService.cs

@@ -37,21 +37,23 @@ public interface IKeyboardShortcutService
     Task DeleteKeyboardShortcutAsync(Guid shortcutId);
 
     /// <summary>
-    /// Gets the mail operation for the given key combination.
+    /// Gets the keyboard shortcut for the given key combination in a specific mode.
     /// </summary>
+    /// <param name="mode">The application mode to search within.</param>
     /// <param name="key">The pressed key.</param>
     /// <param name="modifierKeys">The modifier keys pressed.</param>
-    /// <returns>The mail operation if found, otherwise null.</returns>
+    /// <returns>The matching shortcut if found, otherwise null.</returns>
-    Task<MailOperation?> GetMailOperationForKeyAsync(string key, ModifierKeys modifierKeys);
+    Task<KeyboardShortcut> GetShortcutForKeyAsync(WinoApplicationMode mode, string key, ModifierKeys modifierKeys);
 
     /// <summary>
     /// Checks if a key combination is already assigned to another shortcut.
     /// </summary>
+    /// <param name="mode">The application mode to check within.</param>
     /// <param name="key">The key to check.</param>
     /// <param name="modifierKeys">The modifier keys to check.</param>
     /// <param name="excludeShortcutId">Optional ID to exclude from the check (for updates).</param>
     /// <returns>True if the combination is already used, false otherwise.</returns>
-    Task<bool> IsKeyCombinationInUseAsync(string key, ModifierKeys modifierKeys, Guid? excludeShortcutId = null);
+    Task<bool> IsKeyCombinationInUseAsync(WinoApplicationMode mode, string key, ModifierKeys modifierKeys, Guid? excludeShortcutId = null);
 
     /// <summary>
     /// Creates default keyboard shortcuts for common mail operations.

Wino.Core.Domain/Interfaces/ILaunchProtocolService.cs

@@ -1,4 +1,5 @@
-using Wino.Core.Domain.Models.Launch;
+using System;
+using Wino.Core.Domain.Models.Launch;
 
 namespace Wino.Core.Domain.Interfaces;
 
@@ -13,4 +14,5 @@ public interface ILaunchProtocolService
     /// Used to handle mailto links.
     /// </summary>
     MailToUri MailToUri { get; set; }
+
 }

Wino.Core.Domain/Interfaces/IMailDialogService.cs

@@ -1,11 +1,15 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Models;
+using Wino.Core.Domain.Models.Accounts;
+using Wino.Core.Domain.Models.Calendar;
 using Wino.Core.Domain.Models.Folders;
 
 namespace Wino.Core.Domain.Interfaces;
@@ -18,6 +22,7 @@ public interface IMailDialogService : IDialogServiceBase
     // Custom dialogs
     Task<IMailItemFolder> ShowMoveMailFolderDialogAsync(List<IMailItemFolder> availableFolders);
     Task<MailAccount> ShowAccountPickerDialogAsync(List<MailAccount> availableAccounts);
+    Task<AccountCalendarPickingResult> ShowSingleCalendarPickerDialogAsync(List<CalendarPickerAccountGroup> availableCalendarGroups);
 
     /// <summary>
     /// Displays a dialog to the user for reordering accounts.
@@ -38,7 +43,7 @@ public interface IMailDialogService : IDialogServiceBase
     /// Presents a dialog to the user for signature creation/modification.
     /// </summary>
     /// <returns>Signature information. Null if canceled.</returns>
-    Task<AccountSignature> ShowSignatureEditorDialog(AccountSignature signatureModel = null);
+    Task<AccountSignature> ShowSignatureEditorDialog(AccountSignature? signatureModel = null);
 
     /// <summary>
     /// Presents a dialog to the user for account alias creation/modification.
@@ -56,7 +61,7 @@ public interface IMailDialogService : IDialogServiceBase
     /// </summary>
     /// <param name="existingShortcut">Existing shortcut to edit, or null for new shortcut.</param>
     /// <returns>Dialog result with shortcut information.</returns>
-#pragma warning disable CS8625 // Cannot convert null literal to non-nullable reference type.
+#pragma warning disable CS8625
     Task<KeyboardShortcutDialogResult> ShowKeyboardShortcutDialogAsync(KeyboardShortcut existingShortcut = null);
 #pragma warning restore CS8625
 
@@ -65,5 +70,11 @@ public interface IMailDialogService : IDialogServiceBase
     /// </summary>
     /// <param name="contact">Existing contact to edit, or null for new contact.</param>
     /// <returns>Contact information. Null if canceled.</returns>
-    Task<AccountContact> ShowEditContactDialogAsync(AccountContact contact = null);
+    Task<AccountContact?> ShowEditContactDialogAsync(AccountContact? contact = null);
+
+    Task<WinoAccount?> ShowWinoAccountRegistrationDialogAsync();
+
+    Task<WinoAccount?> ShowWinoAccountLoginDialogAsync();
+
+    Task<WinoAccountSyncExportResult?> ShowWinoAccountExportDialogAsync();
 }

Wino.Core.Domain/Interfaces/IMailItemDisplayInformation.cs

@@ -20,9 +20,11 @@ public interface IMailItemDisplayInformation : INotifyPropertyChanged
     bool IsCalendarEvent { get; }
     bool IsFlagged { get; }
     DateTime CreationDate { get; }
-    string Base64ContactPicture { get; }
+    Guid? ContactPictureFileId { get; }
     bool ThumbnailUpdatedEvent { get; }
-    bool IsBusy { get; }
     bool IsThreadExpanded { get; }
     AccountContact SenderContact { get; }
+    bool HasReadReceiptTracking { get; }
+    bool IsReadReceiptAcknowledged { get; }
+    string ReadReceiptDisplayText { get; }
 }

Wino.Core.Domain/Interfaces/IMenuOperation.cs

@@ -4,4 +4,5 @@ public interface IMenuOperation
 {
     bool IsEnabled { get; }
     string Identifier { get; }
+    bool IsSecondaryMenuPreferred { get; }
 }

Wino.Core.Domain/Interfaces/IMimeFileService.cs

@@ -59,6 +59,26 @@ public interface IMimeFileService
     /// </summary>
     Task<bool> DeleteMimeMessageAsync(Guid accountId, Guid fileId);
 
+    /// <summary>
+    /// Returns cached translated html for the given mime resource if it exists.
+    /// </summary>
+    Task<string> GetTranslatedHtmlAsync(Guid accountId, Guid fileId, string targetLanguage, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Saves translated html for the given mime resource.
+    /// </summary>
+    Task SaveTranslatedHtmlAsync(Guid accountId, Guid fileId, string targetLanguage, string html, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Returns cached summary text for the given mime resource if it exists.
+    /// </summary>
+    Task<string> GetSummaryTextAsync(Guid accountId, Guid fileId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Saves summary text for the given mime resource.
+    /// </summary>
+    Task SaveSummaryTextAsync(Guid accountId, Guid fileId, string summary, CancellationToken cancellationToken = default);
+
     /// <summary>
     /// Prepares the final model containing rendering details.
     /// </summary>

Wino.Core.Domain/Interfaces/INewThemeService.cs

@@ -15,6 +15,7 @@ public interface INewThemeService : IInitializeAsync
     Task<List<AppThemeBase>> GetAvailableThemesAsync();
     Task<CustomThemeMetadata> CreateNewCustomThemeAsync(string themeName, string accentColor, byte[] wallpaperData);
     Task<List<CustomThemeMetadata>> GetCurrentCustomThemesAsync();
+    Task<bool> DeleteCustomThemeAsync(Guid themeId);
     List<string> GetAvailableAccountColors();
     Task ApplyCustomThemeAsync(bool isInitializing);
 
@@ -37,4 +38,10 @@ public interface INewThemeService : IInitializeAsync
 
     // Backdrop management
     List<BackdropTypeWrapper> GetAvailableBackdropTypes();
+
+    /// <summary>
+    /// Re-applies the current theme (backdrop, root theme, accent, caption colors)
+    /// to the currently active window. Use after a window transition.
+    /// </summary>
+    Task ApplyThemeToActiveWindowAsync();
 }

Wino.Core.Domain/Interfaces/INotificationBuilder.cs

@@ -20,6 +20,16 @@ public interface INotificationBuilder
     /// <returns></returns>
     Task UpdateTaskbarIconBadgeAsync();
 
+    /// <summary>
+    /// Adds to the calendar app-entry badge count for newly downloaded events.
+    /// </summary>
+    Task AddCalendarTaskbarBadgeCountAsync(int newlyDownloadedCount);
+
+    /// <summary>
+    /// Clears the calendar app-entry badge.
+    /// </summary>
+    Task ClearCalendarTaskbarBadgeAsync();
+
     /// <summary>
     /// Removes the toast notification for a specific mail by unique id.
     /// </summary>
@@ -36,8 +46,14 @@ public interface INotificationBuilder
     /// </summary>
     void CreateWebView2RuntimeMissingNotification();
 
+    /// <summary>
+    /// Shows a notification when a Microsoft Store update is available.
+    /// </summary>
+    void CreateStoreUpdateNotification();
+
     /// <summary>
     /// Creates a calendar reminder toast for the specified calendar item.
     /// </summary>
     Task CreateCalendarReminderNotificationAsync(CalendarItem calendarItem, long reminderDurationInSeconds);
 }
+

Wino.Core.Domain/Interfaces/IPreferencesService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.ComponentModel;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Models.Calendar;
@@ -57,6 +57,47 @@ public interface IPreferencesService : INotifyPropertyChanged
     /// </summary>
     WinoApplicationMode DefaultApplicationMode { get; set; }
 
+    /// <summary>
+    /// Setting: Whether Microsoft Store update notifications should be shown.
+    /// </summary>
+    bool IsStoreUpdateNotificationsEnabled { get; set; }
+
+    /// <summary>
+    /// Setting: Whether the Wino account profile button in the shell title bar should be hidden.
+    /// </summary>
+    bool IsWinoAccountButtonHidden { get; set; }
+
+    /// <summary>
+    /// Setting: Whether AI actions panels and their toggle buttons should be hidden.
+    /// </summary>
+    bool IsAiActionsPanelHidden { get; set; }
+
+    /// <summary>
+    /// Setting: Default target language code used for AI translation actions.
+    /// </summary>
+    string AiDefaultTranslationLanguageCode { get; set; }
+
+    /// <summary>
+    /// Setting: Preferred target language code for AI summarize actions.
+    /// </summary>
+    string AiSummarizeLanguageCode { get; set; }
+
+    /// <summary>
+    /// Setting: Preferred folder path used when saving AI summaries.
+    /// </summary>
+    string AiSummarySavePath { get; set; }
+
+    /// <summary>
+    /// Serializes the current syncable preferences snapshot.
+    /// </summary>
+    string ExportPreferences();
+
+    /// <summary>
+    /// Deserializes and applies a preferences snapshot.
+    /// Returns the applied and failed property counts.
+    /// </summary>
+    (int appliedCount, int failedCount) ImportPreferences(string settingsJson);
+
     #endregion
 
     #region Mail
@@ -77,7 +118,7 @@ public interface IPreferencesService : INotifyPropertyChanged
     int MarkAsDelay { get; set; }
 
     /// <summary>
-    /// Setting: Ask comfirmation from the user during permanent delete.
+    /// Setting: Ask confirmation from the user during permanent delete.
     /// </summary>
     bool IsHardDeleteProtectionEnabled { get; set; }
 
@@ -146,11 +187,6 @@ public interface IPreferencesService : INotifyPropertyChanged
     /// </summary>
     MailOperation RightHoverAction { get; set; }
 
-    /// <summary>
-    /// Setting: Whether Mailkit Protocol Logger is enabled for ImapTestService or not.
-    /// </summary>
-    bool IsMailkitProtocolLoggerEnabled { get; set; }
-
     /// <summary>
     /// Setting: Which entity id (merged account or folder) should be expanded automatically on startup.
     /// </summary>
@@ -210,11 +246,13 @@ public interface IPreferencesService : INotifyPropertyChanged
     #region Calendar
 
     DayOfWeek FirstDayOfWeek { get; set; }
+    bool IsWorkingHoursEnabled { get; set; }
     TimeSpan WorkingHourStart { get; set; }
     TimeSpan WorkingHourEnd { get; set; }
     DayOfWeek WorkingDayStart { get; set; }
     DayOfWeek WorkingDayEnd { get; set; }
     double HourHeight { get; set; }
+    string CalendarTimedDayHeaderDateFormat { get; set; }
 
     /// <summary>
     /// Setting: Default reminder duration in seconds for new calendar events.
@@ -222,6 +260,21 @@ public interface IPreferencesService : INotifyPropertyChanged
     /// </summary>
     long DefaultReminderDurationInSeconds { get; set; }
 
+    /// <summary>
+    /// Setting: Default snooze duration in minutes for calendar reminder notifications.
+    /// </summary>
+    int DefaultSnoozeDurationInMinutes { get; set; }
+
+    /// <summary>
+    /// Setting: How the New Event button chooses a calendar.
+    /// </summary>
+    NewEventButtonBehavior NewEventButtonBehavior { get; set; }
+
+    /// <summary>
+    /// Setting: Default calendar used when New Event is configured to always use a specific calendar.
+    /// </summary>
+    Guid? DefaultNewEventCalendarId { get; set; }
+
     CalendarSettings GetCurrentCalendarSettings();
 
     #endregion

Wino.Core.Domain/Interfaces/IPrintService.cs

@@ -1,9 +1,12 @@
-using System.Threading.Tasks;
+using System;
+using System.IO;
+using System.Threading.Tasks;
 using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Printing;
 
 namespace Wino.Core.Domain.Interfaces;
 
 public interface IPrintService
 {
-    Task<PrintingResult> PrintPdfFileAsync(string pdfFilePath, string printTitle);
+    Task<PrintingResult> PrintAsync(nint windowHandle, string printTitle, Func<WebView2PrintSettingsModel, Task<Stream>> renderPdfStreamAsync);
 }

Wino.Core.Domain/Interfaces/IRequestBundle.cs

@@ -1,4 +1,5 @@
-using Wino.Core.Domain.Entities.Calendar;
+using System;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Enums;
 
@@ -68,5 +69,6 @@ public interface IFolderActionRequest : IRequestBase
 public interface ICalendarActionRequest : IRequestBase
 {
     CalendarItem Item { get; }
+    Guid? LocalCalendarItemId { get; }
     CalendarSynchronizerOperation Operation { get; }
 }

Wino.Core.Domain/Interfaces/ISentMailReceiptService.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using MimeKit;
+using Wino.Core.Domain.Entities.Mail;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface ISentMailReceiptService
+{
+    Task PopulateReceiptStateAsync(MailCopy mailCopy);
+    Task PopulateReceiptStatesAsync(IReadOnlyCollection<MailCopy> mailCopies);
+    Task TrackSentMailAsync(MailCopy mailCopy, MimeMessage mimeMessage = null);
+    Task ProcessIncomingReceiptAsync(MailCopy receiptMail, MimeMessage mimeMessage);
+}

Wino.Core.Domain/Interfaces/IShareActivationService.cs

@@ -0,0 +1,14 @@
+#nullable enable
+using System;
+using Wino.Core.Domain.Models.Launch;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IShareActivationService
+{
+    MailShareRequest? PendingShareRequest { get; set; }
+    MailShareRequest? ConsumePendingShareRequest();
+    void ClearPendingShareRequest();
+    void StagePendingComposeShareRequest(Guid draftUniqueId, MailShareRequest shareRequest);
+    MailShareRequest? ConsumePendingComposeShareRequest(Guid draftUniqueId);
+}

Wino.Core.Domain/Interfaces/IShellClient.cs

@@ -0,0 +1,79 @@
+#nullable enable
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.MenuItems;
+using Wino.Core.Domain.Models;
+using Wino.Core.Domain.Models.Calendar;
+using Wino.Core.Domain.Models.Folders;
+using Wino.Core.Domain.Models.Navigation;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IShellClient : INotifyPropertyChanged
+{
+    WinoApplicationMode Mode { get; }
+    IDispatcher Dispatcher { get; set; }
+    MenuItemCollection? MenuItems { get; }
+    object? SelectedMenuItem { get; set; }
+    bool HandlesNavigationSelection { get; }
+
+    void Activate(ShellModeActivationContext activationContext);
+    void Deactivate();
+    Task HandleNavigationItemInvokedAsync(IMenuItem? menuItem);
+    Task HandleNavigationSelectionChangedAsync(IMenuItem? menuItem);
+    Task KeyboardShortcutHook(KeyboardShortcutTriggerDetails args);
+}
+
+public interface IMailShellClient : IShellClient
+{
+    IMenuItem CreatePrimaryMenuItem { get; }
+
+    IEnumerable<FolderOperationMenuItem> GetFolderContextMenuActions(IBaseFolderMenuItem folder);
+    Task HandleAccountCreatedAsync(MailAccount createdAccount);
+    Task NavigateFolderAsync(IBaseFolderMenuItem baseFolderMenuItem, TaskCompletionSource<bool>? folderInitAwaitTask = null);
+    Task ChangeLoadedAccountAsync(IAccountMenuItem clickedBaseAccountMenuItem, bool navigateInbox = true);
+    Task PerformFolderOperationAsync(FolderOperation operation, IBaseFolderMenuItem folderMenuItem);
+    Task PerformMoveOperationAsync(IEnumerable<MailCopy> items, IBaseFolderMenuItem targetFolderMenuItem);
+    Task CreateNewMailForAsync(MailAccount account);
+}
+
+public interface ICalendarShellClient : IShellClient
+{
+    IStatePersistanceService StatePersistenceService { get; }
+    IEnumerable DateNavigationHeaderItems { get; }
+    int SelectedDateNavigationHeaderIndex { get; }
+    VisibleDateRange? CurrentVisibleRange { get; }
+    string VisibleDateRangeText { get; }
+    bool CanSynchronizeCalendars { get; }
+    ICommand SyncCommand { get; }
+    ICommand TodayClickedCommand { get; }
+    ICommand DateClickedCommand { get; }
+    ICommand PreviousDateRangeCommand { get; }
+    ICommand NextDateRangeCommand { get; }
+    IEnumerable GroupedAccountCalendars { get; }
+}
+
+public interface IShellViewModel
+{
+    WinoApplicationMode CurrentMode { get; }
+    IShellClient CurrentClient { get; }
+    MenuItemCollection? CurrentMenuItems { get; }
+    object? SelectedMenuItem { get; set; }
+
+    void SetCurrentMode(WinoApplicationMode mode);
+    IShellClient GetClient(WinoApplicationMode mode);
+}
+
+public interface IShellHost
+{
+    bool HasShellContent { get; }
+
+    void ActivateMode(WinoApplicationMode mode, ShellModeActivationContext activationContext);
+}

Wino.Core.Domain/Interfaces/IStatePersistenceService.cs

@@ -18,16 +18,16 @@ public interface IStatePersistanceService : INotifyPropertyChanged
     /// </summary>
     string CoreWindowTitle { get; set; }
 
+    /// <summary>
+    /// App mode title shown in the title bar.
+    /// </summary>
+    string AppModeTitle { get; set; }
+
     /// <summary>
     /// When only reader page is visible in small sized window.
     /// </summary>
     bool IsReaderNarrowed { get; set; }
 
-    /// <summary>
-    /// Should display back button on the shell title bar.
-    /// </summary>
-    bool IsBackButtonVisible { get; }
-
     /// <summary>
     /// Current application mode (Mail or Calendar).
     /// Not persisted to configuration, only kept in memory.
@@ -39,16 +39,6 @@ public interface IStatePersistanceService : INotifyPropertyChanged
     /// </summary>
     bool IsEventDetailsVisible { get; set; }
 
-    /// <summary>
-    /// Whether ManageAccountsPage has navigated to a sub-page and can go back.
-    /// </summary>
-    bool IsManageAccountsNavigating { get; set; }
-
-    /// <summary>
-    /// Whether SettingsPage has navigated to a sub-page and can go back.
-    /// </summary>
-    bool IsSettingsNavigating { get; set; }
-
     /// <summary>
     /// Setting: Opened pane length for the navigation view.
     /// </summary>
@@ -74,4 +64,5 @@ public interface IStatePersistanceService : INotifyPropertyChanged
     /// Setting: Calendar display count for the day view.
     /// </summary>
     int DayDisplayCount { get; set; }
+
 }

Wino.Core.Domain/Interfaces/IStoreManagementService.cs

@@ -1,6 +1,6 @@
-using System.Threading.Tasks;
+#nullable enable
+using System.Threading.Tasks;
 using Wino.Core.Domain.Enums;
-using Wino.Core.Domain.Models.Store;
 
 namespace Wino.Core.Domain.Interfaces;
 
@@ -9,10 +9,20 @@ public interface IStoreManagementService
     /// <summary>
     /// Checks whether user has the type of an add-on purchased.
     /// </summary>
-    Task<bool> HasProductAsync(StoreProductType productType);
+    Task<bool> HasProductAsync(WinoAddOnProductType productType);
 
     /// <summary>
     /// Attempts to purchase the given add-on.
     /// </summary>
-    Task<StorePurchaseResult> PurchaseAsync(StoreProductType productType);
+    Task<StorePurchaseResult> PurchaseAsync(WinoAddOnProductType productType);
+
+    /// <summary>
+    /// Requests a Microsoft Store collections ID key for the current customer.
+    /// </summary>
+    Task<string?> GetCustomerCollectionsIdAsync(string serviceTicket, string publisherUserId);
+
+    /// <summary>
+    /// Requests a Microsoft Store purchase ID key for the current customer.
+    /// </summary>
+    Task<string?> GetCustomerPurchaseIdAsync(string serviceTicket, string publisherUserId);
 }

Wino.Core.Domain/Interfaces/IStoreUpdateService.cs

@@ -0,0 +1,12 @@
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IStoreUpdateService
+{
+    bool HasAvailableUpdate { get; }
+
+    Task<bool> RefreshAvailabilityAsync(bool showNotification = false);
+
+    Task<bool> StartUpdateAsync();
+}