Add per-account folder customization page (#855)

Introduce a dedicated settings page that lets users reorder, hide,
and pin/unpin folders per account. Folders are organized into Pinned,
Categories (Gmail only), and More sections with drag-to-reorder via
ListView. New Order column on MailItemFolder persists the custom
layout; the default sort falls back to alphabetic when no custom
order is set. A reset action wipes all customization in a single
transaction and restores system-folder stickiness.

Co-authored-by: Claude <noreply@anthropic.com>

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

@@ -24,6 +24,11 @@ public class MailItemFolder : IMailItemFolder
     public bool IsSynchronizationEnabled { get; set; }
     public bool IsHidden { get; set; }
     public bool ShowUnreadCount { get; set; }
+
+    // User-defined ordering within its navigation section (Pinned / Categories / More).
+    // 0 means "no custom order set" — the folder falls back to the default sort
+    // (alphabetic for More, canonical SpecialFolderType order as a tiebreak for Pinned).
+    public int Order { get; set; }
     public DateTime? LastSynchronizedDate { get; set; }
 
     // For IMAP

Wino.Core.Domain/Enums/WinoPage.cs

@@ -12,6 +12,7 @@ public enum WinoPage
     ContactsPage,
     MailRenderingPage,
     AccountDetailsPage,
+    FolderCustomizationPage,
     MergedAccountDetailsPage,
     ManageAccountsPage,
     AccountManagementPage,

Wino.Core.Domain/Interfaces/IFolderService.cs

@@ -22,6 +22,25 @@ public interface IFolderService
     Task<int> GetFolderNotificationBadgeAsync(Guid folderId);
     Task ChangeStickyStatusAsync(Guid folderId, bool isSticky);
 
+    /// <summary>
+    /// Toggles a folder's visibility in the navigation menu.
+    /// Hidden folders are still synchronized if sync is enabled.
+    /// </summary>
+    Task ChangeFolderHiddenStatusAsync(Guid folderId, bool isHidden);
+
+    /// <summary>
+    /// Persists a new custom ordering for the given folders.
+    /// The first id becomes Order=1, second Order=2, etc.
+    /// Caller is responsible for notifying the shell to refresh.
+    /// </summary>
+    Task UpdateFolderOrdersAsync(Guid accountId, IReadOnlyList<Guid> orderedFolderIds);
+
+    /// <summary>
+    /// Wipes every user folder customization for the account: clears custom Order,
+    /// un-hides folders, and restores IsSticky on system folders.
+    /// </summary>
+    Task ResetFolderCustomizationAsync(Guid accountId);
+
     Task<MailAccount> UpdateSystemFolderConfigurationAsync(Guid accountId, SystemFolderConfiguration configuration);
     Task ChangeFolderSynchronizationStateAsync(Guid folderId, bool isSynchronizationEnabled);
     Task ChangeFolderShowUnreadCountStateAsync(Guid folderId, bool showUnreadCount);

Wino.Core.Domain/Models/Settings/SettingsNavigationItemInfo.cs

@@ -176,6 +176,7 @@ public static class SettingsNavigationInfoProvider
             WinoPage.AccountDetailsPage => WinoPage.ManageAccountsPage,
             WinoPage.MergedAccountDetailsPage => WinoPage.ManageAccountsPage,
             WinoPage.AliasManagementPage => WinoPage.ManageAccountsPage,
+            WinoPage.FolderCustomizationPage => WinoPage.ManageAccountsPage,
             WinoPage.MailCategoryManagementPage => WinoPage.ManageAccountsPage,
             WinoPage.SignatureManagementPage => WinoPage.ManageAccountsPage,
             WinoPage.ImapCalDavSettingsPage => WinoPage.ManageAccountsPage,

Wino.Core.Domain/Translations/en_US/resources.json

@@ -885,6 +885,21 @@
     "SettingsManageAliases_Title": "Aliases",
     "SettingsMailCategories_Description": "Manage synchronized and local categories for this account.",
     "SettingsMailCategories_Title": "Categories",
+    "FolderCustomization_Title": "Customize folder list",
+    "FolderCustomization_Description": "Reorder, hide, or pin folders for this account.",
+    "FolderCustomization_EntryCardTitle": "Customize folder list",
+    "FolderCustomization_EntryCardDescription": "Arrange pinned folders, hide folders you don't use, and reorder the More section.",
+    "FolderCustomization_SectionPinned": "Pinned",
+    "FolderCustomization_SectionCategories": "Categories",
+    "FolderCustomization_SectionMore": "More",
+    "FolderCustomization_Pin": "Pin to top",
+    "FolderCustomization_Unpin": "Move to More",
+    "FolderCustomization_Show": "Show in navigation",
+    "FolderCustomization_Hide": "Hide from navigation",
+    "FolderCustomization_Reset": "Reset to defaults",
+    "FolderCustomization_ResetConfirmTitle": "Reset folder layout",
+    "FolderCustomization_ResetConfirmMessage": "This will clear any custom folder order and restore the default alphabetic layout for this account. Hidden folders will become visible again. Continue?",
+    "FolderCustomization_EmptySection": "Drag folders here to add them to this section.",
     "SettingsEditAccountDetails_Title": "Edit Account Details",
     "SettingsEditAccountDetails_Description": "Change account name, sender name and assign a new color if you like.",
     "SettingsAccountDetails_NavigationTitle": "{0} details",