feat: initial commit - Habo habit tracking app

- Complete MVP with Repository Pattern, SQLite storage
- Provider + ChangeNotifier state management
- Navigation 2.0 with deep link support
- Habit CRUD with twoDayRule, notifications, categories
- Backup/Restore via JSON
- Statistics with streak tracking
- Material You theme support
- Biometric lock support
- Desktop widget support
- 27 languages i18n structure
- Comprehensive test suite (87/89 passing)

lib/model/settings_data.dart

@@ -0,0 +1,50 @@
+class SettingsData {
+  // Appearance
+  String theme;
+  String weekStart;
+  bool showMonthName;
+  bool showCategories;
+
+  // Notifications
+  bool showDailyNot;
+  int notTimeHour;
+  int notTimeMinute;
+
+  // Sound
+  bool soundEffects;
+  double soundVolume;
+
+  // Security
+  bool biometricLock;
+  bool oneTapCheck;
+
+  // Onboarding
+  bool seenOnboarding;
+  String lastWhatsNewVersion;
+
+  // Custom Colors
+  int checkColor;
+  int failColor;
+  int skipColor;
+  int progressColor;
+
+  SettingsData({
+    this.theme = 'device',
+    this.weekStart = 'monday',
+    this.showMonthName = true,
+    this.showCategories = true,
+    this.showDailyNot = true,
+    this.notTimeHour = 20,
+    this.notTimeMinute = 0,
+    this.soundEffects = true,
+    this.soundVolume = 3.0,
+    this.biometricLock = false,
+    this.oneTapCheck = false,
+    this.seenOnboarding = false,
+    this.lastWhatsNewVersion = '',
+    this.checkColor = 0xFF09BF30,
+    this.failColor = 0xFFF44336,
+    this.skipColor = 0xFFFBC02D,
+    this.progressColor = 0xFF2196F3,
+  });
+}