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.

lib/screens/home_screen.dart

@@ -8,6 +8,7 @@ import 'package:notas/models/note.dart';
 import 'package:notas/screens/note_editor_screen.dart';
 import 'package:notas/widgets/app_title_bar.dart';
 import 'package:notas/widgets/menu_drawer.dart';
+import 'package:notas/screens/settings_screen.dart';
 import 'package:notas/widgets/note_card.dart';
 import 'package:notas/widgets/search_app_bar.dart';
 
@@ -18,14 +19,20 @@ import 'package:notas/widgets/search_app_bar.dart';
 // - Drag & drop reordering (updates `index` in the database)
 
 class HomeScreen extends StatefulWidget {
-  const HomeScreen({super.key});
+  const HomeScreen({
+    super.key,
+    required this.repository,
+    required this.onDeleteAllData,
+  });
+
+  final NoteRepository repository;
+  final Future<void> Function() onDeleteAllData;
 
   @override
   State<HomeScreen> createState() => _HomeScreenState();
 }
 
 class _HomeScreenState extends State<HomeScreen> {
-  final NoteRepository _repository = NoteRepository();
   List<Note> _notes = <Note>[];
   String _searchQuery = '';
   bool _isLoading = true;
@@ -39,7 +46,7 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   Future<void> _loadNotes() async {
-    final List<Note> storedNotes = await _repository.loadNotes();
+    final List<Note> storedNotes = await widget.repository.loadNotes();
 
     if (!mounted) {
       return;
@@ -59,7 +66,7 @@ class _HomeScreenState extends State<HomeScreen> {
     }
 
     if (result is Note) {
-      final Note createdNote = await _repository.createNote(result);
+      final Note createdNote = await widget.repository.createNote(result);
       final List<Note> updatedNotes = _normalizeNotes(<Note>[createdNote, ..._notes]);
 
       if (!mounted) {
@@ -73,7 +80,7 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   Future<void> _deleteNote(Note note) async {
-    await _repository.deleteNote(note);
+    await widget.repository.deleteNote(note);
 
     final List<Note> updatedNotes = _normalizeNotes(
       _notes.where((Note item) => item.id != note.id).toList(),
@@ -97,7 +104,7 @@ class _HomeScreenState extends State<HomeScreen> {
     final Note movedNote = updatedNotes.removeAt(oldIndex);
     updatedNotes.insert(newIndex, movedNote);
 
-    await _repository.moveNote(movedNote, newIndex);
+    await widget.repository.moveNote(movedNote, newIndex);
 
     if (!mounted) {
       return;
@@ -123,7 +130,7 @@ class _HomeScreenState extends State<HomeScreen> {
     if (result is Note) {
       final int noteIndex = _notes.indexWhere((Note item) => item == note);
       if (noteIndex != -1) {
-        final Note savedNote = await _repository.updateNote(result);
+        final Note savedNote = await widget.repository.updateNote(result);
         final List<Note> updatedNotes = [..._notes];
         updatedNotes[noteIndex] = savedNote;
 
@@ -293,8 +300,20 @@ class _HomeScreenState extends State<HomeScreen> {
             );
 
     return Scaffold(
-      body: SafeArea(
-        child: Column(
+      body: Container(
+        decoration: const BoxDecoration(
+          gradient: LinearGradient(
+            colors: [
+              Color(0xFF191A1D),
+              Color(0xFF222326),
+              Color(0xFF101114),
+            ],
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+          ),
+        ),
+        child: SafeArea(
+          child: Column(
           children: [
             const AppTitleBar(),
             SearchAppBar(
@@ -353,6 +372,16 @@ class _HomeScreenState extends State<HomeScreen> {
                           setState(() {
                             _isMenuOpen = false;
                           });
+
+                          if (item == 'settings') {
+                            Navigator.of(context).push(
+                              MaterialPageRoute(
+                                builder: (_) => SettingsScreen(
+                                  onDeleteAllData: widget.onDeleteAllData,
+                                ),
+                              ),
+                            );
+                          }
                         },
                       ),
                     ),
@@ -361,7 +390,8 @@ class _HomeScreenState extends State<HomeScreen> {
               ),
             ),
           ],
-        ),
+            ),
+          ),
       ),
       floatingActionButton: FloatingActionButton(
         onPressed: _openNoteComposer,