fix(record): 记录 switch_tab，并按 tab 维护 Trace v3 页面状态 - #108
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Co-authored-by: Cursor <cursoragent@cursor.com>
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摘要
switch_tab（由supports_tab_switch_steps能力协商开启）。settledByTab），切 tab 后的操作绑定到当前 tab 的页面状态，而不再误用上一个 tab 的lastSettled。switch_tab，保持旧客户端兼容。背景
基于
feat/trace-v3-recorder。此前多 tab 录制时，切 tab 后的 click/fill 可能错误关联到前一个 tab 的 settled state。测试计划
trace.json含op: "switch_tab"，且后续 step 使用目标 tab 的 statessupports_tab_switch_steps的客户端不会产出或依赖switch_tab