feat: integrate Flutter Quill for rich text editing and update note handling

- Added Flutter Quill package for rich text editing capabilities.
- Refactored note body handling to support Quill's Document format.
- Updated note editor screen to use QuillEditor and QuillController.
- Enhanced note search functionality to convert note body to plain text.
- Modified note card display to show plain text from note body.
- Updated localization support for Quill in the app.
- Registered necessary plugins for URL launching and file selection on all platforms.
- Updated app icons and other assets for consistency across platforms.
- Updated pubspec.yaml and pubspec.lock to include new dependencies and versions.

test/note_editor_screen_test.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_quill/flutter_quill.dart';
 
 import 'package:notas/models/category.dart';
 import 'package:notas/models/note.dart';
@@ -13,6 +15,12 @@ void main() {
 
     await tester.pumpWidget(
       MaterialApp(
+        localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
+          GlobalMaterialLocalizations.delegate,
+          GlobalWidgetsLocalizations.delegate,
+          GlobalCupertinoLocalizations.delegate,
+          FlutterQuillLocalizations.delegate,
+        ],
         home: Scaffold(
           body: NoteEditorScreen(
             note: null,
@@ -55,6 +63,12 @@ void main() {
 
     await tester.pumpWidget(
       MaterialApp(
+        localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
+          GlobalMaterialLocalizations.delegate,
+          GlobalWidgetsLocalizations.delegate,
+          GlobalCupertinoLocalizations.delegate,
+          FlutterQuillLocalizations.delegate,
+        ],
         home: Scaffold(
           body: NoteEditorScreen(
             note: null,
@@ -78,4 +92,4 @@ void main() {
 
     expect(completionCount, 1);
   });
-}
+}