fix(controls): Fix theme and accent color reset after Windows session unlock (#1608)

* Fix theme and accent color reset after Windows session unlock

- Add session switch event handling to restore theme and accent color after unlock
- Store current theme and accent color before session lock
- Ignore WM_WININICHANGE messages during unlock restore period (5 seconds)
- Preserve stored theme when it differs from system theme
- Optimize code by removing unnecessary operations and using switch expressions
- Remove debug output statements

* Revert "Fix theme and accent color reset after Windows session unlock"

This reverts commit 9b61717.

* Changes to the Conditions for Executing UpdateObservedWindow

Author: Koichi-Kobayashi

src/Wpf.Ui/Appearance/SystemThemeWatcher.cs

@@ -151,7 +151,9 @@ public static void UnWatch(Window? window)
     /// </summary>
     private static IntPtr WndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
     {
-        if (msg == (int)PInvoke.WM_WININICHANGE)
+        if (msg == (int)PInvoke.WM_DWMCOLORIZATIONCOLORCHANGED ||
+            msg == (int)PInvoke.WM_THEMECHANGED ||
+            msg == (int)PInvoke.WM_SYSCOLORCHANGE)
         {
             UpdateObservedWindow(hWnd);
         }