fix: panel dock frozen after page refresh — barrier rejects every new fence - #5
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… fence The host's anchor key is `<kindLen>:<kind><id>` (`14:assistant-step3:0`); `anchorSeqOf` grabbed the FIRST number in the key — the kind-name length constant — so every assistant step yielded the same order[0]. The panel store's persisted replay barrier (hydration sets replayBarrier = persisted maxSeenSeq = that constant) then rejected every new panel:true fence after a refresh. Dock froze on the old snapshot, actions kept working, zero logs (issue #4). - anchorSeqOf: parse `<turn>:<step>` from assistant-step keys → seq = turn*1000+step, strictly monotonic in message order and growing across reloads; document-order fallback kept for non-assistant / anchor-less (Safari) rows. Also un-freezes the /panel local-override barrier, which depended on the same broken seq. - Diagnostics: one-time console.warn per source per page session when a barrier rejects an op ([genui] prefix, values included); budget-overflow rejections stay on the existing budget diagnostic. Closes #4
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Closes #4 — 页面刷新后面板 dock 冻结，新 panel:true 围栏被持久化重放屏障静默拒绝。
根因（与 issue 排查一致，已在宿主源码证实）
宿主 anchor key 格式 =
conversationContextKey(kind, id)=${kind长度}:${kind}${id}；assistant step 的 id 是${turn}:${step}→ 完整 key 如14:assistant-step3:0。DOM 通道anchorSeqOf旧实现取 key 里第一个数字 = kind 名称长度常量（assistant-step=14，所有消息相同）→ 面板 store 的持久化屏障（刷新后replayBarrier = 持久化 maxSeenSeq= 该常量）拒绝一切新围栏（order[0] <= barrier）：dock 停在旧快照、旧按钮 action 仍活、控制台零日志、清 localStorage 恢复但刷新复发。修复
src/client/dom-fence.tsxanchorSeqOf：从 assistant-step key 解析<turn>:<step>，seq = turn*1000+step—— 随消息顺序严格单调，刷新后新消息的 turn 必然大于持久化屏障 → 新面板正常更新；历史重放（同 turn）依旧被屏障正确杀死。非 assistant 行 / 无锚点（Safari）行保留文档序兜底/panel本地覆盖连带修复：localBarrier同样依赖该 seq，此前 /panel 一次也会冻结后续所有面板更新——同一根因，一并解决applyPanelOperationbarrier 拒绝路径加一次性console.warn（[genui] 面板操作被重放屏障拒绝（source …，order[0]=… ≤ replayBarrier … / localBarrier …），每 source 每页面会话一条）；预算 overflow 后置 append 拒绝仍走既有 budget 诊断不重复告警验证
expected '面板B' to be '面板C'，精确复现报告症状；同 turn 内 step 单调性；屏障拒绝告警一次/条lib/client.js已重建并提交