refactor: Update Note and Category models to use 'id' instead of 'uuid', and adjust related database operations

- Changed 'uuid' to 'id' in Note and Category models for consistency.
- Updated database operations in NoteRepository to reflect the new 'id' field.
- Modified sync models to accommodate changes in Note and Category structures.
- Adjusted the handling of notes and categories during synchronization.
- Refactored the note editor and home screen to use the new 'id' field.
- Ensured that the 'isDirty' flag is properly set and utilized across models.

lib/models/note.dart

@@ -2,63 +2,58 @@ import 'package:uuid/uuid.dart';
 
 // Model: Note
 // - Representa una nota guardada en la app.
-// - `id` es el identificador local de SQLite (autoincrement).
-// - `uuid` es el identificador global sincronizado con el servidor.
-// - `index` representa el orden visual dentro de la lista.
-// - `serverVersion` se usa para resolver conflictos en sync.
-// - `isDeleted` marca eliminaciones blandas.
 class Note {
   Note({
-    this.id,
-    String? uuid,
+    String? id,
     required this.title,
     required this.body,
     required this.createdAt,
     required this.updatedAt,
-    required this.index,
+    required this.position,
+    this.categoryId,
     this.serverVersion = 0,
     this.isDeleted = false,
     this.isPermanentlyDeleted = false,
-    this.categoryId,
-  }) : uuid = uuid ?? Uuid().v4();
+    this.isDirty = true,
+  }) : id = id ?? Uuid().v4();
 
-  final int? id;
-  final String uuid;
+  final String id;
   final String title;
   final String body;
   final DateTime createdAt;
   final DateTime updatedAt;
-  final int index;
+  final double position;
+  final String? categoryId;
   final int serverVersion;
   final bool isDeleted;
   final bool isPermanentlyDeleted;
-  final String? categoryId;
+  final bool isDirty;
 
   Note copyWith({
-    int? id,
-    String? uuid,
+    String? id,
     String? title,
     String? body,
     DateTime? createdAt,
     DateTime? updatedAt,
-    int? index,
+    double? position,
+    String? categoryId,
     int? serverVersion,
     bool? isDeleted,
     bool? isPermanentlyDeleted,
-    String? categoryId,
+    bool? isDirty,
   }) {
     return Note(
       id: id ?? this.id,
-      uuid: uuid ?? this.uuid,
       title: title ?? this.title,
       body: body ?? this.body,
       createdAt: createdAt ?? this.createdAt,
       updatedAt: updatedAt ?? this.updatedAt,
-      index: index ?? this.index,
+      position: position ?? this.position,
+      categoryId: categoryId ?? this.categoryId,
       serverVersion: serverVersion ?? this.serverVersion,
       isDeleted: isDeleted ?? this.isDeleted,
       isPermanentlyDeleted: isPermanentlyDeleted ?? this.isPermanentlyDeleted,
-      categoryId: categoryId ?? this.categoryId,
+      isDirty: isDirty ?? this.isDirty,
     );
   }
 
@@ -68,9 +63,9 @@ class Note {
       return true;
     }
 
-    return other is Note && uuid == other.uuid;
+    return other is Note && id == other.id;
   }
 
   @override
-  int get hashCode => uuid.hashCode;
-}
+  int get hashCode => id.hashCode;
+}