程序员阿江(Relakkes) d9ce2f09e1 refactor(desktop): move trace entry into Settings
Trace is a low-frequency diagnostic feature, so its entry points no
longer sit in primary chrome:

- Remove the Trace nav item above the session list in the sidebar
- Remove the trace open/open-window buttons from the session header
- Add a Trace tab in Settings between Token usage and Diagnostics,
  embedding the existing TraceList page full-bleed
- Add settings.tab.trace and drop unused sidebar.traces across locales
2026-06-11 01:42:40 +08:00
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