Send language to Watch and handle locale changes

iOS: Update WatchSessionManager to send the current language via WCSession.default.updateApplicationContext with logging and error handling, in addition to existing transferUserInfo. Dart: await initLang during startup and add dispatcher.onLocaleChanged handler that re-initializes language when the app is in auto-language mode, logs locale changes, and triggers a global UI update.

firka/ios/Runner/WatchSessionManager.swift

@@ -242,6 +242,13 @@ class WatchSessionManager: NSObject, WCSessionDelegate {
             return
         }
 
+        do {
+            try WCSession.default.updateApplicationContext(["language": languageCode])
+            print("[WatchSessionManager] Language '\(languageCode)' sent to Watch via applicationContext")
+        } catch {
+            print("[WatchSessionManager] Failed to update applicationContext for language: \(error)")
+        }
+
         WCSession.default.transferUserInfo([
             "id": "language_update",
             "language": languageCode

firka/lib/main.dart

@@ -190,7 +190,7 @@ void initTheme(AppInitialization data) {
 
 Future<void> _initData(AppInitialization init) async {
   await init.settings.load(init.isar.appSettingsModels);
-  initLang(init);
+  await initLang(init);
   initTheme(init);
   init.settings = SettingsStore(init.l10n);
   await init.settings.load(init.isar.appSettingsModels);
@@ -202,6 +202,27 @@ Future<void> _initData(AppInitialization init) async {
     initTheme(init);
   };
 
+  dispatcher.onLocaleChanged = () {
+    final languageSetting =
+        init.settings.group("settings").subGroup("application")["language"]
+            as SettingsItemsRadio;
+    final isAutoLanguage = languageSetting.activeIndex == 0;
+    if (!isAutoLanguage) {
+      return;
+    }
+
+    final previousLocale = init.l10n.localeName;
+    unawaited(() async {
+      await initLang(init);
+      final nextLocale = init.l10n.localeName;
+      if (previousLocale != nextLocale) {
+        logger.info(
+            "[Init] System locale changed in auto mode: $previousLocale -> $nextLocale");
+      }
+      globalUpdate.update();
+    }());
+  };
+
   resetOldTimeTableCache(init.isar);
   resetOldHomeworkCache(init.isar);