suzmii
d4e7b8bbaf
队列满时被吞掉的按需请求留痕：点播放没反应不再是静默
- requestPreview 在队列达上限且没有可顶掉的可见性预取时，按需请求（detail/play）此前直接 return，用户在可见卡上点播放没有任何请求与痕迹；
- 新增 droppedRequestsRef：单调计数 + 最近一条明细（identity / reason / queueLength / at），并补一条 [preview-queue] console.warn；
- previewQueueSnapshot 暴露 droppedRequestCount 与 lastDroppedRequest，排障与用例可直接观测；
- 可见性预取撞上限属于设计内背压（下一轮兜底扫描会补），不计入丢弃口径；
- 队列上限、3 个并发槽、优先级顺序（play > detail > visible）全部不动；
- 新增用例：压满 96 条 detail 后 play 被丢弃必须留下标记，且 visible 背压不计数。
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