fix: compile errors - field initializers in collection, desktop scope

- Move _statusText/_retryButton initialization out of collection initializer
- Use panel.Children index to assign field references after construction
- Fix 'desktop' variable scope in DeskLinkApp.cs

Author: Fabian Kirchweger

src/HaDeskLink/DeskLinkApp.cs

@@ -78,7 +78,7 @@ private void StartWebSocket(Config config, HaApiClient api)
             );
 
             // Pass WS to MainWindow for retry button
-            if (desktop.MainWindow is Views.MainWindow mw)
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime dt && dt.MainWindow is Views.MainWindow mw)
                 mw.SetWebSocketClient(_ws);
 
             _ = Task.Run(async () =>

src/HaDeskLink/Views/MainWindow.axaml.cs

@@ -138,7 +138,7 @@ public MainWindow(Config config, HaApiClient api)
                 },
 
                 // Status text (for login failure messages)
-                _statusText = new TextBlock
+                new TextBlock
                 {
                     Text = "",
                     FontSize = 13,
@@ -148,7 +148,7 @@ public MainWindow(Config config, HaApiClient api)
                 },
 
                 // Retry button (hidden by default)
-                _retryButton = new Button
+                new Button
                 {
                     Content = "🔄 Erneut verbinden",
                     FontSize = 14,
@@ -168,8 +168,10 @@ public MainWindow(Config config, HaApiClient api)
         var quickActionsBtn = (Button)panel.Children[4];
         quickActionsBtn.Click += OnQuickActions;
 
-        // Retry button
-        _retryButton!.Click += OnRetryClicked;
+        // Status text and retry button references
+        _statusText = (TextBlock)panel.Children[7];
+        _retryButton = (Button)panel.Children[8];
+        _retryButton.Click += OnRetryClicked;
 
         Content = panel;
     }