Add actionable push notifications for iOS and Android

iOS:
- Add notification categories with action buttons (complete, view, cancel, etc.)
- Handle notification actions in AppDelegate with API calls
- Add navigation to specific task from notification tap
- Register UNNotificationCategory for each task state

Android:
- Add NotificationActionReceiver BroadcastReceiver for handling actions
- Update MyFirebaseMessagingService to show action buttons
- Add deep link handling in MainActivity for task navigation
- Register receiver in AndroidManifest.xml

Shared:
- Add navigateToTaskId parameter to App for cross-platform navigation
- Add notification observers in MainTabView/AllTasksView for refresh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

iosApp/push_test_payloads/task_generic_free_user.apns

@@ -0,0 +1,20 @@
+{
+    "Simulator Target Bundle": "com.tt.casera.CaseraDev",
+    "aps": {
+        "alert": {
+            "title": "Casera",
+            "body": "Something in Casera needs your attention"
+        },
+        "sound": "default",
+        "badge": 1,
+        "category": "TASK_NOTIFICATION_GENERIC",
+        "mutable-content": 1
+    },
+    "task_id": 303,
+    "task_name": "Secret Task Name",
+    "residence_id": 1,
+    "residence_name": "Test Residence",
+    "notification_type": "task_overdue",
+    "button_types": ["edit", "complete", "cancel", "mark_in_progress"],
+    "is_premium": false
+}