🐛 fix: restore getBounds mock in Browser test beforeEach (#11254)

Fix failing close event handling tests by restoring the getBounds mock
return value in beforeEach after vi.clearAllMocks(). The issue occurred
because clearAllMocks() removed the getBounds mock behavior set during
hoisting, causing x and y coordinates to be undefined instead of 0.

apps/desktop/src/main/core/browser/__tests__/Browser.test.ts

@@ -133,6 +133,7 @@ describe('Browser', () => {
     vi.useFakeTimers();
 
     // Reset mock behaviors
+    mockBrowserWindow.getBounds.mockReturnValue({ height: 600, width: 800, x: 0, y: 0 });
     mockBrowserWindow.isDestroyed.mockReturnValue(false);
     mockBrowserWindow.isVisible.mockReturnValue(true);
     mockBrowserWindow.isFocused.mockReturnValue(true);