提交 Nontonki 短剧原型，准备推送到远程仓库。

Co-authored-by: Cursor <cursoragent@cursor.com>

test/playback/seek_progress_bar_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:nontonki/pages/player/widgets/seek_progress_bar.dart';
+import 'package:video_player/video_player.dart';
+
+void main() {
+  test('seek target stays inside playable duration', () {
+    const duration = Duration(seconds: 12);
+    expect(seekPositionForFraction(0, duration), Duration.zero);
+    expect(
+      seekPositionForFraction(0.5, duration),
+      greaterThan(const Duration(seconds: 5)),
+    );
+    expect(seekPositionForFraction(1, duration), lessThan(duration));
+  });
+
+  testWidgets('horizontal slider drag previews and seeks on release', (
+    tester,
+  ) async {
+    final video = ValueNotifier<VideoPlayerValue>(
+      const VideoPlayerValue(
+        duration: Duration(seconds: 12),
+        position: Duration(seconds: 3),
+        isInitialized: true,
+      ),
+    );
+    addTearDown(video.dispose);
+    var started = 0;
+    Duration? target;
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: Center(
+            child: SizedBox(
+              width: 300,
+              child: SeekProgressBar(
+                valueListenable: video,
+                semanticsLabel: 'Seek video',
+                onScrubStart: () => started++,
+                onSeek: (position) async {
+                  target = position;
+                },
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+
+    final gesture = await tester.startGesture(
+      tester.getCenter(find.byType(Slider)),
+    );
+    await gesture.moveBy(const Offset(120, 0));
+    await tester.pump();
+    expect(started, 1);
+    expect(target, isNull);
+    await gesture.up();
+    await tester.pumpAndSettle();
+    expect(target, isNotNull);
+    expect(target!, greaterThan(const Duration(seconds: 3)));
+    expect(target!, lessThan(const Duration(seconds: 12)));
+  });
+
+  testWidgets('compact seek bar shows time only while dragging', (
+    tester,
+  ) async {
+    final video = ValueNotifier<VideoPlayerValue>(
+      const VideoPlayerValue(
+        duration: Duration(seconds: 12),
+        position: Duration(seconds: 3),
+        isInitialized: true,
+      ),
+    );
+    addTearDown(video.dispose);
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: SeekProgressBar(
+            valueListenable: video,
+            semanticsLabel: 'Seek video',
+            compactIdle: true,
+            onSeek: (_) async {},
+          ),
+        ),
+      ),
+    );
+    expect(find.text('00:03'), findsNothing);
+    final gesture = await tester.startGesture(
+      tester.getCenter(find.byType(Slider)),
+    );
+    await gesture.moveBy(const Offset(40, 0));
+    await tester.pump();
+    expect(find.text('00:12'), findsOneWidget);
+    await gesture.up();
+    await tester.pumpAndSettle();
+    expect(find.text('00:12'), findsNothing);
+  });
+}