重构ClipboardRecordingModel以支持可选的时间戳，并更新相关测试以改进JSON解析和验证。

lib/features/recording/model/model_clipboard.dart

@@ -19,8 +19,8 @@ class ClipboardRecordingModel {
   factory ClipboardRecordingModel.fromJson(Map<String, dynamic> json) {
     return ClipboardRecordingModel(
       title: _readString(json, 'title'),
-      startTimestamp: _readInt(json, 'startTimestamp'),
-      endTimestamp: _readInt(json, 'endTimestamp'),
+      startTimestamp: _readOptionalInt(json, 'startTimestamp'),
+      endTimestamp: _readOptionalInt(json, 'endTimestamp'),
       address: _readString(json, 'address'),
       filename: _readOptionalString(json, 'filename'),
     );
@@ -52,8 +52,9 @@ class ClipboardRecordingModel {
     throw FormatException('Clipboard field "$key" must be a String.');
   }
 
-  static int _readInt(Map<String, dynamic> json, String key) {
+  static int? _readOptionalInt(Map<String, dynamic> json, String key) {
     final value = json[key];
+    if (value == null) return null;
     if (value is int) return value;
     throw FormatException('Clipboard field "$key" must be an int.');
   }

lib/features/recording/view-model/view_model_recording.dart

@@ -30,8 +30,6 @@ class RecordingViewModel extends StateNotifier<RecordingModel> {
         RecordingModel(
           clipboardRecordingModel: ClipboardRecordingModel(
             title: '',
-            startTimestamp: 0,
-            endTimestamp: 0,
             address: '',
           ),
         ),
@@ -40,8 +38,6 @@ class RecordingViewModel extends StateNotifier<RecordingModel> {
 
   static final _defaultClipboard = ClipboardRecordingModel(
     title: '',
-    startTimestamp: 0,
-    endTimestamp: 0,
     address: '',
   );
 

test/features/recording/model_clipboard_test.dart

@@ -21,6 +21,21 @@ void main() {
       expect(model.toJson(), clipboardJson);
     });
 
+    test('parses JSON without optional timestamps', () {
+      final json = {
+        'title': '郑昌梦 丨黄伟依 空中格斗赛 小学组',
+        'address': '广东省汕头市番禺区青蓝街 111 号',
+        'filename': '郑昌梦_黄伟依_6月3日测试-1_空中格斗赛',
+      };
+      final model = ClipboardRecordingModel.fromJson(json);
+
+      expect(model.title, json['title']);
+      expect(model.address, json['address']);
+      expect(model.filename, json['filename']);
+      expect(model.startTimestamp, isNull);
+      expect(model.endTimestamp, isNull);
+    });
+
     test('parses optional filename from mini program JSON', () {
       final json = {
         ...clipboardJson,
@@ -41,7 +56,7 @@ void main() {
       );
     });
 
-    test('throws FormatException when required field has wrong type', () {
+    test('throws FormatException when optional int field has wrong type', () {
       final json = {...clipboardJson, 'startTimestamp': '1717334400'};
 
       expect(
@@ -49,5 +64,14 @@ void main() {
         throwsA(isA<FormatException>()),
       );
     });
+
+    test('throws FormatException when required address is missing', () {
+      final json = Map<String, dynamic>.from(clipboardJson)..remove('address');
+
+      expect(
+        () => ClipboardRecordingModel.fromJson(json),
+        throwsA(isA<FormatException>()),
+      );
+    });
   });
 }

test/features/recording/view_model_recording_test.dart

@@ -105,7 +105,7 @@ void main() {
       );
     });
 
-    test('returns invalid when clipboard JSON misses required fields', () async {
+    test('returns invalid when clipboard JSON misses required address', () async {
       await setClipboardText('{"title":"王东方 丨李想 空中格斗赛"}');
       final container = ProviderContainer();
       addTearDown(container.dispose);
@@ -121,6 +121,31 @@ void main() {
       );
     });
 
+    test(
+      'updates state when clipboard omits optional timestamps',
+      () async {
+        await setClipboardText(
+          '{"title":"郑昌梦 丨黄伟依 空中格斗赛 小学组","address":"广东省汕头市番禺区青蓝街 111 号","filename":"郑昌梦_黄伟依_6月3日测试-1_空中格斗赛"}',
+        );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+
+        final result = await container
+            .read(recordingViewModelProvider.notifier)
+            .getClipboardContent();
+
+        expect(result, ClipboardReadResult.success);
+        final model = container.read(recordingViewModelProvider);
+        expect(model.hasValidClipboardInfo, isTrue);
+        expect(model.clipboardRecordingModel.startTimestamp, isNull);
+        expect(model.clipboardRecordingModel.endTimestamp, isNull);
+        expect(
+          model.clipboardRecordingModel.filename,
+          '郑昌梦_黄伟依_6月3日测试-1_空中格斗赛',
+        );
+      },
+    );
+
     test('returns invalid when clipboard JSON has wrong field type', () async {
       await setClipboardText(
         '{"title":"王东方 丨李想 空中格斗赛","startTimestamp":"1717334400","endTimestamp":1717334400,"address":"广州市番禺区·粤港澳大湾区青年人才双创小镇"}',