feat(theme): Add system overlay style for consistent UI appearance

lib/shared/theme/app_theme.dart

@@ -2,6 +2,7 @@ import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_animate/flutter_animate.dart';
 import 'theme_extensions.dart';
 import 'tweakcn_themes.dart';
@@ -115,6 +116,13 @@ class AppTheme {
         elevation: Elevation.none,
         backgroundColor: surfaces.background,
         foregroundColor: tokens.neutralOnSurface,
+        systemOverlayStyle: SystemUiOverlayStyle(
+          statusBarBrightness: brightness,
+          statusBarIconBrightness: isDark ? Brightness.light : Brightness.dark,
+          systemNavigationBarIconBrightness: isDark
+              ? Brightness.light
+              : Brightness.dark,
+        ),
       ),
       bottomSheetTheme: BottomSheetThemeData(
         backgroundColor: surfaces.card,