feat(Networking): enhance offline handling and localization for diary and members data

- Added `ACCESS_NETWORK_STATE` permission in AndroidManifest.xml to monitor network connectivity.
- Introduced `NetworkConnectivityHolder` to manage network state and trigger data refresh when connectivity is restored.
- Updated `DiaryManager` and `MembersManager` to support offline caching, allowing users to view previously loaded data when offline.
- Enhanced localization by adding new keys for offline cache hints in both German and English, improving user experience during connectivity issues.
- Updated UI components to display offline cache messages, ensuring users are informed when data is being served from cache.

scripts/generate-mobile-i18n.js

@@ -75,6 +75,7 @@ const MOBILE_STRINGS = {
     'mobile.noMembers': 'Keine Mitglieder gefunden',
     'mobile.noResults': 'Keine Treffer',
     'mobile.noTimes': 'Keine Zeiten',
+    'mobile.offlineCacheHint': 'Keine Verbindung – zuletzt geladene Daten.',
     'mobile.participationTop': 'Top Teilnahmen',
     'mobile.refresh': 'Aktualisieren',
     'mobile.requestedAccess': 'Angefragt',
@@ -115,6 +116,7 @@ const MOBILE_STRINGS = {
     'mobile.noMembers': 'No members found',
     'mobile.noResults': 'No results',
     'mobile.noTimes': 'No times',
+    'mobile.offlineCacheHint': 'No connection – showing last loaded data.',
     'mobile.participationTop': 'Top attendance',
     'mobile.refresh': 'Refresh',
     'mobile.requestedAccess': 'Requested',
@@ -131,6 +133,33 @@ const MOBILE_STRINGS = {
     'mobile.inactive': 'Inactive',
     'mobile.user': 'User',
   },
+  es: {
+    'mobile.offlineCacheHint': 'Sin conexión: se muestran los datos cargados por última vez.',
+  },
+  fr: {
+    'mobile.offlineCacheHint': 'Pas de connexion – affichage des données du dernier chargement.',
+  },
+  it: {
+    'mobile.offlineCacheHint': 'Nessuna connessione – dati dell’ultimo caricamento.',
+  },
+  pl: {
+    'mobile.offlineCacheHint': 'Brak połączenia – wyświetlane ostatnio wczytane dane.',
+  },
+  ja: {
+    'mobile.offlineCacheHint': 'ネットワークに接続されていません。最後に読み込んだデータを表示しています。',
+  },
+  th: {
+    'mobile.offlineCacheHint': 'ไม่มีการเชื่อมต่อ – แสดงข้อมูลที่โหลดล่าสุด',
+  },
+  tl: {
+    'mobile.offlineCacheHint': 'Walang koneksyon – ipinapakita ang huling na-load na datos.',
+  },
+  fil: {
+    'mobile.offlineCacheHint': 'Walang koneksyon – ipinapakita ang huling na-load na datos.',
+  },
+  zh: {
+    'mobile.offlineCacheHint': '无网络连接，显示上次加载的数据。',
+  },
 };
 
 /** Kalender-Tab (CalendarScreen.kt): eigene Übersetzungen pro Locale, damit nicht nur Deutsch aus dem Basis-Flat greift. */