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

lib/models/note.dart

@@ -18,6 +18,7 @@ class Note {
     required this.index,
     this.serverVersion = 0,
     this.isDeleted = false,
+    this.isPermanentlyDeleted = false,
     this.categoryId,
   }) : uuid = uuid ?? Uuid().v4();
 
@@ -30,6 +31,7 @@ class Note {
   final int index;
   final int serverVersion;
   final bool isDeleted;
+  final bool isPermanentlyDeleted;
   final String? categoryId;
 
   Note copyWith({
@@ -42,6 +44,7 @@ class Note {
     int? index,
     int? serverVersion,
     bool? isDeleted,
+    bool? isPermanentlyDeleted,
     String? categoryId,
   }) {
     return Note(
@@ -54,6 +57,7 @@ class Note {
       index: index ?? this.index,
       serverVersion: serverVersion ?? this.serverVersion,
       isDeleted: isDeleted ?? this.isDeleted,
+      isPermanentlyDeleted: isPermanentlyDeleted ?? this.isPermanentlyDeleted,
       categoryId: categoryId ?? this.categoryId,
     );
   }