feat: Refactor MaterialApp initialization into a separate method for improved readability

lib/main.dart

@@ -136,10 +136,16 @@ class _MeshCoreSarAppState extends State<MeshCoreSarApp> {
               ),
         ),
       ],
-      child: Builder(
+      child: _buildMaterialApp(),
+    );
+  }
+
+  Widget _buildMaterialApp() {
+    return Builder(
       builder: (context) {
         final systemBrightness = MediaQuery.platformBrightnessOf(context);
         return MaterialApp(
+          key: ValueKey<String?>('${_locale?.languageCode ?? 'system'}_${_themeMode.name}'),
           title: 'MeshCore SAR',
           debugShowCheckedModeBanner: false,
           theme: AppTheme.getTheme(_themeMode, systemBrightness),
@@ -159,7 +165,6 @@ class _MeshCoreSarAppState extends State<MeshCoreSarApp> {
           ),
         );
       },
-      ),
     );
   }
 }