✨implement light and dark theme

lib/core/theme/theme_provider.dart

@@ -0,0 +1,82 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'colors.dart';
+
+class ThemeProvider extends ChangeNotifier {
+  static const String _themeKey = 'theme_mode';
+  static BuildContext? _context;
+
+  bool _isDarkMode = false;
+
+  bool get isDarkMode => _isDarkMode;
+
+  // Set the app context for rebuilding
+  static void setContext(BuildContext context) {
+    _context = context;
+  }
+
+  ThemeProvider() {
+    _loadThemeFromPrefs();
+  }
+
+  static void _rebuildAllChildren() {
+    void rebuild(Element el) {
+      el.markNeedsBuild();
+      el.visitChildren(rebuild);
+    }
+
+    if (_context != null) {
+      (_context as Element).visitChildren(rebuild);
+    }
+  }
+
+  Future<void> _loadThemeFromPrefs() async {
+    final prefs = await SharedPreferences.getInstance();
+    _isDarkMode = prefs.getBool(_themeKey) ?? false;
+
+    // Update AppColors
+    AppColors.setDarkMode(_isDarkMode);
+
+    // Notify listeners after loading
+    notifyListeners();
+  }
+
+  Future<void> toggleTheme() async {
+    _isDarkMode = !_isDarkMode;
+
+    // Update AppColors
+    AppColors.setDarkMode(_isDarkMode);
+
+    // Save to preferences
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_themeKey, _isDarkMode);
+
+    // Notify all listeners to rebuild
+    notifyListeners();
+
+    // Force rebuild all children for immediate theme update
+    _rebuildAllChildren();
+  }
+
+  Future<void> setDarkMode(bool isDark) async {
+    if (_isDarkMode == isDark) {
+      return;
+    }
+
+    _isDarkMode = isDark;
+
+    // Update AppColors
+    AppColors.setDarkMode(_isDarkMode);
+
+    // Save to preferences
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_themeKey, _isDarkMode);
+
+    // Notify all listeners to rebuild
+    notifyListeners();
+
+    // Force rebuild all children for immediate theme update
+    _rebuildAllChildren();
+  }
+}