chore(client): 归档原型阶段未提交改动（binding/logic/view 分层与各页迭代）

为什么：客户端原型在 14d7bd3 之后又做了一轮（页面分层、发现页、分类滑动、播放器控件等），
一直留在工作区没入库。下一批账号链路要改其中的 app.dart / home_view / player_view / mine_view，
先归档这批既存改动，本批的实际 diff 才说得清边界。

只归档，不改行为：当前工作区 flutter analyze 0 问题、flutter test 148 全过。

test/playback/watch_history_test.dart

@@ -1,4 +1,5 @@
 import 'package:flutter_test/flutter_test.dart';
+import 'package:nontonki/core/data/models/drama.dart';
 import 'package:nontonki/core/data/repositories/watch_history_repository.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
 import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
@@ -51,4 +52,79 @@ void main() {
     expect(await history.lastEpisodeId('profile-a', 'drama-a'), 'episode-2');
     expect(await history.lastEpisodeId('profile-a', 'drama-b'), isNull);
   });
+
+  test('resume prefers the first loaded episode', () async {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+    final history = SharedPreferencesWatchHistoryRepository();
+    await history.save(
+      'profile-a',
+      'drama-a',
+      'episode-1',
+      const Duration(seconds: 3),
+    );
+    await history.save(
+      'profile-a',
+      'drama-a',
+      'episode-2',
+      const Duration(seconds: 5),
+    );
+
+    final drama = Drama(
+      id: 'drama-a',
+      title: 'title',
+      synopsis: 'synopsis',
+      posterUrl: '',
+      episodes: const [
+        Episode(id: 'episode-1', number: 1, title: 'E1', isFree: true),
+        Episode(id: 'episode-2', number: 2, title: 'E2', isFree: true),
+      ],
+    );
+
+    expect(
+      await history.resumePositionFor('profile-a', drama),
+      const Duration(seconds: 3),
+    );
+  });
+
+  test('resume falls back to the last watched episode for a list card', () async {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+    final history = SharedPreferencesWatchHistoryRepository();
+    await history.save(
+      'profile-a',
+      'drama-a',
+      'episode-2',
+      const Duration(seconds: 5),
+    );
+
+    const card = Drama(
+      id: 'drama-a',
+      title: 'title',
+      synopsis: 'synopsis',
+      posterUrl: '',
+      totalEpisodes: 12,
+    );
+
+    expect(
+      await history.resumePositionFor('profile-a', card),
+      const Duration(seconds: 5),
+    );
+  });
+
+  test('a list card with no history has no resume position', () async {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+    final history = SharedPreferencesWatchHistoryRepository();
+
+    const card = Drama(
+      id: 'drama-b',
+      title: 'title',
+      synopsis: 'synopsis',
+      posterUrl: '',
+      totalEpisodes: 12,
+    );
+
+    expect(await history.resumePositionFor('profile-a', card), isNull);
+  });
 }