Refactor: Introduce LocaleController and ScaleController, unify text and language settings, and simplify AppSettingsView structure.

finlog_app/app/lib/main.dart

@@ -1,5 +1,7 @@
 import 'package:app/core/app/router.dart';
 import 'package:app/core/app/startup/domain/initialize_app.dart';
+import 'package:app/core/ui/controller/locale_controller.dart';
+import 'package:app/core/ui/controller/scale_controller.dart';
 import 'package:app/core/ui/controller/theme.dart';
 import 'package:flutter/material.dart';
 import 'package:fluttery/fluttery.dart';
@@ -25,37 +27,48 @@ Future<void> main() async {
   final themeController = ThemeController();
   await themeController.init();
 
+  final scaleController = ScaleController();
+  final localeController = LocaleController();
+
   runApp(
     MultiProvider(
-      providers: [ChangeNotifierProvider(create: (context) => themeController)],
-      child: FinlogApp(
-        router: buildAppRouter(startRoute),
-        themeController: themeController,
-      ),
+      providers: [
+        ChangeNotifierProvider(create: (context) => themeController),
+        ChangeNotifierProvider(create: (context) => scaleController),
+        ChangeNotifierProvider(create: (context) => localeController),
+      ],
+      child: FinlogApp(router: buildAppRouter(startRoute)),
     ),
   );
 }
 
 class FinlogApp extends StatelessWidget {
   final GoRouter router;
-  final ThemeController themeController;
 
-  const FinlogApp({
-    super.key,
-    required this.router,
-    required this.themeController,
-  });
+  const FinlogApp({super.key, required this.router});
 
   @override
   Widget build(BuildContext context) {
+    final theme = context.watch<ThemeController>();
+    final textScale = context.watch<ScaleController>();
+    final localeCtrl = context.watch<LocaleController>();
+
     return AnimatedBuilder(
-      animation: themeController,
+      animation: theme,
       builder: (context, _) => MaterialApp.router(
         title: 'Finlog',
+        locale: localeCtrl.locale,
+        supportedLocales: const [Locale('de'), Locale('en')],
         theme: ThemeData.light(),
         darkTheme: ThemeData.dark(),
-        themeMode: themeController.themeMode,
+        themeMode: theme.themeMode,
         routerConfig: router,
+        builder: (context, child) => MediaQuery(
+          data: MediaQuery.of(
+            context,
+          ).copyWith(textScaler: TextScaler.linear(textScale.factor)),
+          child: child ?? Container(),
+        ),
       ),
     );
   }