Fix search and global title bar issues.

Wino.Mail.WinUI/Interfaces/ITitleBarSearchHost.cs

@@ -0,0 +1,16 @@
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+using Wino.Mail.WinUI.Models;
+
+namespace Wino.Mail.WinUI.Interfaces;
+
+public interface ITitleBarSearchHost
+{
+    string SearchText { get; set; }
+    string SearchPlaceholderText { get; }
+    ObservableCollection<TitleBarSearchSuggestion> SearchSuggestions { get; }
+
+    Task OnTitleBarSearchTextChangedAsync();
+    void OnTitleBarSearchSuggestionChosen(TitleBarSearchSuggestion suggestion);
+    Task OnTitleBarSearchSubmittedAsync(string queryText, TitleBarSearchSuggestion? chosenSuggestion);
+}

Wino.Mail.WinUI/Interfaces/IWinoShellWindow.cs

@@ -1,11 +1,10 @@
 using CommunityToolkit.Mvvm.Messaging;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
-using Wino.Messaging.UI;
 
 namespace Wino.Mail.WinUI.Interfaces;
 
-public interface IWinoShellWindow : IRecipient<TitleBarShellContentUpdated>
+public interface IWinoShellWindow
 {
     void HandleAppActivation(string? launchArguments, string? tileId = null, string? appId = null);
     TitleBar GetTitleBar();