[delete-cloud]

Summary

• add webui session list, session summary loading, full history replay through durable run display-events, and resume-mode sending after restoring a session
• render assistant markdown with react-markdown and replace ad hoc diff text with a lightweight structured diff/patch panel
• document the session runs replay contract used by GUI history restore

Verification

• pnpm typecheck
• pnpm test
• pnpm build
• pnpm peers check
• Browser/DevTools manual flow: created a session against http://127.0.0.1:18080, reloaded the tab, restored from the session list via /sessions/{id}, /sessions/{id}/runs, /runs/{run_id}/display-events, then continued via POST /sessions/{id}/resume?event_format=display

Notes

• Local provider execution returned final_result error during run_model, so the HTTP stream and restore/resume request flow were verified, but a successful model answer and ask-mode approval roundtrip were not fully exercised in this local environment.

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[delete-cloud]

Superseded by #567. GitHub refused reopening this PR after the head branch was restored, so the same branch now continues in the replacement draft PR.