feat: implement AI export service and establish project navigation and theming infrastructure + acces internet

lib/core/theme/theme_provider.dart

@@ -1,36 +1,59 @@
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'app_theme.dart';
 
 class ThemeProvider with ChangeNotifier {
   static const String _themeModeKey = 'user_theme_mode';
-  
+  static const String _accentKey = 'user_accent_color';
+
   ThemeMode _themeMode = ThemeMode.system;
+  AppAccentColor _accent = AppAccentColor.blue;
 
   ThemeMode get themeMode => _themeMode;
+  AppAccentColor get currentAccent => _accent;
+  Color get primaryColor => _accent.color;
+
+  ThemeData get lightTheme => AppTheme.buildLightTheme(_accent);
+  ThemeData get darkTheme => AppTheme.buildDarkTheme(_accent);
 
   ThemeProvider() {
-    loadThemeMode();
+    loadSettings();
   }
 
-  Future<void> loadThemeMode() async {
+  Future<void> loadSettings() async {
     final prefs = await SharedPreferences.getInstance();
     final modeIndex = prefs.getInt(_themeModeKey);
+    final accentId = prefs.getString(_accentKey);
+
     if (modeIndex != null) {
       _themeMode = ThemeMode.values[modeIndex];
-      notifyListeners();
     }
+    if (accentId != null) {
+      _accent = AppAccentColor.fromId(accentId);
+    }
+    notifyListeners();
   }
 
   Future<void> setThemeMode(ThemeMode mode) async {
     if (_themeMode == mode) return;
-    
+
     _themeMode = mode;
     notifyListeners();
-    
+
     final prefs = await SharedPreferences.getInstance();
     await prefs.setInt(_themeModeKey, mode.index);
   }
 
+  Future<void> setAccent(AppAccentColor accent) async {
+    if (_accent.id == accent.id) return;
+
+    _accent = accent;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_accentKey, accent.id);
+  }
+
   String get themeModeName {
     switch (_themeMode) {
       case ThemeMode.system: