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/playback_session_test.dart

@@ -12,7 +12,7 @@ void main() {
       id: 'ep-${i + 1}',
       number: i + 1,
       title: 'Episode ${i + 1}',
-      assetPath: 'assets/media/episode_0${i + 1}.mp4',
+      videoUrl: 'https://example.test/episode_0${i + 1}.mp4',
       isFree: i < 2,
     ),
   );
@@ -99,6 +99,47 @@ void main() {
     await session.close();
   });
 
+  test('pausing then swiping to the next episode resumes playback', () async {
+    final factory = FakeFactory();
+    final session = PlaybackSession(
+      episodes: episodes,
+      factory: factory.create,
+      canPlay: (episode) => episode.isFree,
+    );
+    await session.select(0);
+    session.setUserWantsPlay(false);
+    await Future<void>.delayed(Duration.zero);
+    expect(session.userWantsPlay, isFalse);
+
+    await session.select(1);
+
+    expect(session.userWantsPlay, isTrue);
+    await Future<void>.delayed(Duration.zero);
+    final playing = session.active;
+    expect(playing, isA<FakePlayer>());
+    expect((playing! as FakePlayer).playCalls, greaterThan(0));
+    await session.close();
+  });
+
+  test('re-selecting the same episode keeps the user pause', () async {
+    final factory = FakeFactory();
+    final session = PlaybackSession(
+      episodes: episodes,
+      factory: factory.create,
+      canPlay: (episode) => episode.isFree,
+    );
+    await session.select(0);
+    session.setUserWantsPlay(false);
+    await Future<void>.delayed(Duration.zero);
+
+    // 页面重新可见等场景会重复选中同一集，这时不能把暂停改成播放。
+    await session.select(0);
+
+    expect(session.userWantsPlay, isFalse);
+    expect(session.canAutoAdvance, isFalse);
+    await session.close();
+  });
+
   test('automatic advance respects visibility and playback intent', () async {
     final factory = FakeFactory();
     final session = PlaybackSession(