fix(notifications): adds type=button to logout, mocks matchMedia

Author: wgordon17

src/app/components/layout/Header.tsx

@@ -132,6 +132,7 @@ export default function Header() {
         </button>
 
         <button
+          type="button"
           onClick={handleLogout}
           class="text-sm text-gray-500 dark:text-gray-400 hover:text-gray-700 dark:hover:text-gray-200 shrink-0"
           aria-label="Sign out"

tests/components/shared/NotificationDrawer.test.tsx

@@ -14,10 +14,12 @@ beforeEach(() => {
   clearNotifications();
   clearMutedSources();
   vi.useFakeTimers();
+  vi.spyOn(window, "matchMedia").mockReturnValue({ matches: false } as MediaQueryList);
 });
 
 afterEach(() => {
   vi.useRealTimers();
+  vi.restoreAllMocks();
 });
 
 function renderDrawer(open = true, onClose = vi.fn()) {