fix(quick-260611-tfc): make notificationclick openWindow fallback reachable

- Add .then(navigated) check: opens new window when client.navigate() resolves null
- Add .catch(): opens new window when client.focus() or client.navigate() rejects
- Both branches guarded by self.clients.openWindow per spec
- Returned chain (not floating) satisfies no-floating-promises gate
- All other behaviour preserved: close(), url extraction, post-loop fallback

apps/pwa/src/sw.ts

@@ -171,7 +171,16 @@ self.addEventListener('notificationclick', (event: NotificationEvent) => {
       // from the current window location (query string with event uid / date).
       for (const client of clientList) {
         if ('focus' in client) {
-          return client.focus().then(() => client.navigate(url));
+          return client
+            .focus()
+            .then(() => client.navigate(url))
+            .then((navigated) => {
+              if (navigated === null && self.clients.openWindow)
+                return self.clients.openWindow(url);
+            })
+            .catch(() => {
+              if (self.clients.openWindow) return self.clients.openWindow(url);
+            });
         }
       }
       // No existing window — open a new one at the deep-link URL