fix: tray icon click opens main window reliably after quick prompt use

showAndFocusWindow() used BrowserWindow.getAllWindows()[0] to find the
main window, which breaks once the quick prompt window is created —
the array order is not guaranteed and windows[0] may resolve to the
quick prompt instead, causing the show/focus calls to target a hidden,
frameless window.

Accept the main window reference as an explicit parameter and guard
against destroyed windows with isDestroyed().

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/index.ts

@@ -63,9 +63,9 @@ async function bootstrap(): Promise<void> {
       applyTitleBarTheme(mainWindow, workspace.settings.theme);
 
       systemTray = new SystemTray({
-        onShowWindow: showAndFocusWindow,
+        onShowWindow: () => showAndFocusWindow(mainWindow!),
         onCreateScratchpad: () => {
-          showAndFocusWindow();
+          showAndFocusWindow(mainWindow!);
           mainWindow?.webContents.send('tray:create-scratchpad');
         },
         onQuit: () => app.quit(),
@@ -127,8 +127,8 @@ app.on('window-all-closed', () => {
 app.on('activate', async () => {
   if (BrowserWindow.getAllWindows().length === 0) {
     await bootstrap();
-  } else {
-    showAndFocusWindow();
+  } else if (mainWindow && !mainWindow.isDestroyed()) {
+    showAndFocusWindow(mainWindow);
   }
 });