Implement local vault service with encryption key management and integrate it into the app. Add settings screen for data management and enhance home screen with new features. Update database connection for encryption support and modify repository to use the new database structure. Improve UI elements across the application for better user experience.

pubspec.yaml

@@ -41,6 +41,8 @@ dependencies:
   shared_preferences: ^2.3.2
   window_manager: ^0.5.1
   intl: ^0.19.0
+  flutter_secure_storage: ^10.2.0
+  sqlite3: ^3.3.1
 
 dev_dependencies:
   flutter_test:
@@ -66,6 +68,11 @@ flutter:
   # the material Icons class.
   uses-material-design: true
 
+hooks:
+  user_defines:
+    sqlite3:
+      source: sqlite3mc
+
   # To add assets to your application, add an assets section, like this:
   # assets:
   #   - images/a_dot_burr.jpeg