Refactoring

lib/domain/entities/note_chunk.dart

@@ -0,0 +1,16 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'note_chunk.freezed.dart';
+
+/// A single text chunk produced by splitting a trainer's note.
+/// [sourceId] groups all chunks that came from the same original note
+/// (useful for bulk deletion later).
+@freezed
+class NoteChunkEntity with _$NoteChunkEntity {
+  const factory NoteChunkEntity({
+    required String id,
+    required String text,
+    required String sourceId,
+    required String createdAt,
+  }) = _NoteChunkEntity;
+}