fix: Update components and styles to work with >= HA 2026.2 (#2333)

Caution: Requires HA >= `2026.2`

- Closes #2329
- Closes #2332

src/camera-manager/frigate/event-watcher.ts

@@ -39,8 +39,12 @@ export class FrigateEventWatcher implements FrigateEventWatcherSubscriptionInter
     );
 
     if (!this._hasSubscribers(request.instanceID)) {
-      await this._unsubscribeCallback[request.instanceID]();
+      const callback = this._unsubscribeCallback[request.instanceID];
       delete this._unsubscribeCallback[request.instanceID];
+
+      // Callback may be undefined if unsubscribe is called while subscribe is
+      // still awaiting the Home Assistant connection.
+      await callback?.();
     }
   }