[delete-cloud]

Summary

• redesign the WebUI around a responsive session workspace with a collapsible session sidebar and operational right rail
• add checkpoint, result, settings, memory review, diff, and expanded timeline workflows
• bind asynchronous updates and restores to their originating session and clarify checkpoint restore boundaries

Verification

• ./node_modules/.bin/vitest run (88 passed)
• ./node_modules/.bin/tsc -b --noEmit
• ./node_modules/.bin/tsc -b && ./node_modules/.bin/vite build
• uv run pytest tests/ui/test_http_server.py -q -k "runtime_config or memory_review or session_result or checkpoint" (21 passed)
• desktop and narrow-viewport production preview screenshots
• git diff --cached --check

Review

Independent local review found no P0/P1 issues. Its two P2 findings were fixed before commit: runtime settings now use PATCH response truth without presenting an unreadable approval policy as current, and checkpoint restore explicitly states that workspace files are unchanged.

No postmortem/index.yaml entry matches webui/app/**, so no additional release checks apply.

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[delete-cloud]

Local production-path verification after o6n became unavailable:

• isolated local API (127.0.0.1:18080) and production WebUI (127.0.0.1:4173)
• browser exercised session creation, prompt/failure result, runtime settings PATCH, checkpoint create/restore, workspace diff/patch, memory panel, and 390px responsive layout
• 35 API requests completed with 2xx responses; no browser console errors
• mobile viewport: sidebar initially closed, no horizontal overflow, composer controls visible
• local run exposed a terminal-result persistence window; fixed in b2f220a with bounded result retries and a regression test
• vitest: 89/89; typecheck and production build pass

Successful model output remains unverified locally because the stored coding-agent Codex OAuth refresh token returns 401. The UI correctly surfaces that terminal failure in Session Result.