feat: Implement permanent deletion and restoration of notes with updated UI

lib/data/sync_models.dart

@@ -69,6 +69,13 @@ String _readStringValue(dynamic value) {
   return jsonEncode(value);
 }
 
+String _readOptionalStringValue(dynamic value) {
+  if (value == null) {
+    return '';
+  }
+  return _readStringValue(value);
+}
+
 int _readIntValue(dynamic value) {
   if (value is int) {
     return value;
@@ -127,6 +134,7 @@ class SyncNotePayload {
     required this.serverVersion,
     this.position = 0,
     this.isDeleted = false,
+    this.isPermanentlyDeleted = false,
     required this.updatedAt,
   });
 
@@ -137,12 +145,14 @@ class SyncNotePayload {
   final int serverVersion;
   final int position;
   final bool isDeleted;
+  final bool isPermanentlyDeleted;
   final DateTime updatedAt;
 
   factory SyncNotePayload.fromNote(
     Note note, {
     required String encryptedTitle,
     required String encryptedBody,
+    bool isPermanentlyDeleted = false,
   }) {
     return SyncNotePayload(
       id: note.uuid,
@@ -152,6 +162,7 @@ class SyncNotePayload {
       serverVersion: note.serverVersion,
       position: note.index,
       isDeleted: note.isDeleted,
+      isPermanentlyDeleted: isPermanentlyDeleted,
       updatedAt: note.updatedAt,
     );
   }
@@ -165,6 +176,7 @@ class SyncNotePayload {
       'serverVersion': serverVersion,
       if (position != 0) 'position': position,
       if (isDeleted) 'isDeleted': isDeleted,
+      if (isPermanentlyDeleted) 'isPermanentlyDeleted': isPermanentlyDeleted,
       'updatedAt': updatedAt.toIso8601String(),
     };
   }
@@ -237,6 +249,7 @@ class SyncNoteResponse {
     required this.serverVersion,
     this.position = 0,
     this.isDeleted = false,
+    this.isPermanentlyDeleted = false,
     required this.updatedAt,
   });
 
@@ -247,6 +260,7 @@ class SyncNoteResponse {
   final int serverVersion;
   final int position;
   final bool isDeleted;
+  final bool isPermanentlyDeleted;
   final DateTime updatedAt;
 
   factory SyncNoteResponse.fromJson(Map<String, dynamic> json) {
@@ -255,11 +269,12 @@ class SyncNoteResponse {
       categoryId: json['categoryId'] == null
           ? null
           : _readStringValue(json['categoryId']),
-      encryptedTitle: _readStringValue(json['encrypted_title']),
-      encryptedBody: _readStringValue(json['encrypted_body']),
+      encryptedTitle: _readOptionalStringValue(json['encrypted_title']),
+      encryptedBody: _readOptionalStringValue(json['encrypted_body']),
       serverVersion: _readIntValue(json['serverVersion']),
       position: json['position'] as int? ?? 0,
       isDeleted: json['isDeleted'] as bool? ?? false,
+      isPermanentlyDeleted: json['isPermanentlyDeleted'] as bool? ?? false,
       updatedAt: DateTime.parse(json['updatedAt'] as String),
     );
   }
@@ -267,8 +282,8 @@ class SyncNoteResponse {
   Note toNote() {
     return Note(
       uuid: id,
-      title: 'Encrypted', // placeholder, será descifrado por la app
-      body: 'Encrypted', // placeholder, será descifrado por la app
+      title: isPermanentlyDeleted ? '' : 'Encrypted',
+      body: isPermanentlyDeleted ? '' : 'Encrypted',
       createdAt: updatedAt,
       updatedAt: updatedAt,
       index: position,