Cache Jarvis app config on startup

lib/google_calendar_page.dart

@@ -7,6 +7,7 @@ class AccountsPage extends StatefulWidget {
     required this.cachedEvents,
     required this.people,
     required this.jarvisSettings,
+    required this.serverClientId,
     required this.onChanged,
     required this.onSyncedEventsChanged,
   });
@@ -15,6 +16,7 @@ class AccountsPage extends StatefulWidget {
   final List<CalendarEvent> cachedEvents;
   final List<Person> people;
   final JarvisSettings jarvisSettings;
+  final String serverClientId;
   final ValueChanged<List<GoogleCalendarConnection>> onChanged;
   final ValueChanged<List<CalendarEvent>> onSyncedEventsChanged;
 
@@ -51,9 +53,10 @@ class _AccountsPageState extends State<AccountsPage> {
       statusMessage = 'Google napt\u00e1rkapcsolat el\u0151k\u00e9sz\u00edt\u00e9se...';
     });
 
-    final configuredClientId = await _loadGoogleServerClientId();
+    runtimeServerClientId = widget.serverClientId.trim().isNotEmpty
+        ? widget.serverClientId.trim()
+        : await _loadGoogleServerClientId();
     if (!mounted) return;
-    runtimeServerClientId = configuredClientId?.trim();
     await _initializeGoogle();
   }
 
@@ -147,8 +150,9 @@ class _AccountsPageState extends State<AccountsPage> {
 
     try {
       if (!initialized) {
-        final configuredClientId = await _loadGoogleServerClientId();
-        runtimeServerClientId = configuredClientId?.trim();
+        runtimeServerClientId = widget.serverClientId.trim().isNotEmpty
+            ? widget.serverClientId.trim()
+            : await _loadGoogleServerClientId();
         await _ensureGoogleInitialized();
         initialized = true;
       }