feat: apply dark theme

lib/app.dart

@@ -48,19 +48,32 @@ class MyApp extends StatelessWidget {
       return supportedLocales.firstWhere((l) => l.languageCode == 'en');
     };
 
-    return Container(
+    return AntTheme(
       key: auth.rootKey,
-      child: CupertinoApp.router(
+      data: AntThemeData(brightness: theme.brightness),
+      child: Builder(
+        builder: (context) {
+          final antTheme = AntTheme.of(context);
+
+          return CupertinoApp.router(
             routeInformationProvider: router.routeInformationProvider,
             routeInformationParser: router.routeInformationParser,
             routerDelegate: router.routerDelegate,
             theme: CupertinoThemeData(
               brightness: theme.brightness,
-          primaryColor: AntTheme.of(context).colorPrimary,
+              primaryColor: antTheme.colorPrimary,
+              textTheme: CupertinoTextThemeData(
+                textStyle: TextStyle(
+                  fontSize: antTheme.fontSizeMain,
+                  color: antTheme.colorText,
+                ),
+              ),
             ),
             localizationsDelegates: AppLocalizations.localizationsDelegates,
             supportedLocales: AppLocalizations.supportedLocales,
             localeListResolutionCallback: localeListResolutionCallback,
+          );
+        },
       ),
     );
   }