fix: restore jukebox manager standalone drag responsiveness (Project-N-E-K-O#870)

* fix: restore standalone jukebox header button hit-testing

* fix: restore jukebox manager standalone drag responsiveness

将点歌台管理页独立窗口的拖动逻辑改为 pending/manual 状态机，避免在异步读取窗口 bounds/workArea 时丢失快速拖动事件。

保留交互区域点击能力，不影响关闭按钮和内容区控件，并新增前端回归测试覆盖快速拖动与按钮点击场景。

* Fix jukebox manager standalone drag cleanup

* fix: stabilize jukebox manager selection state

* Fix one-hop binding selection behavior

绑定页选择改为一跳联动：选歌曲带上其绑定动画，选动画带上其绑定歌曲，但不再二次扩散。同步让绑定页直接按当前一跳结果导出，并补充单选、全选、导出相关回归测试。

* fix: guard jukebox manager drag release

* test: harden jukebox manager standalone coverage

Author: yiyiyiyiGKY