M5-09: Final desktop/mobile visual and judge comprehension QA

[pillowtalk-Qy]

Type: Independent Visual/Product QA
Priority: P1; P0/P1 findings block freeze
Initial status: Blocked
Owner: Independent visual/product reviewer
Depends on: deployed RC candidate
Blocks: M5-10 when P0/P1
Writable: screenshots and QA report only; fixes via Bug Issues

唯一目标

独立证明 exact RC 在四个固定 viewport 中没有阻碍演示的视觉/交互缺陷，且普通评委能在 20 秒理解核心结果。

固定 viewport

1440x900
1280x720
390x844
360x800

验收

[ ] no overlap/clipping/horizontal scroll
[ ] no text hidden behind fixed controls
[ ] amount mismatch without raw JSON
[ ] status not color-only
[ ] provenance in first viewport/result/export
[ ] MANUAL_REVIEW not green approval
[ ] STOP action boundary visible
[ ] long address/reason/ref fits
[ ] loading/error/result stable
[ ] judge explains core insight in 20 seconds
[ ] screenshots are exact candidate, not old build

验证

pnpm test:e2e --grep 'visual|responsive'

Codex 指令

对四个 viewport 做 exact-RC screenshot/DOM overflow/console checks，输出 P0/P1/P2 findings。
不要在 QA PR 修 UI；缺陷另开 Bug 并附前后验收标准。

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[pillowtalk-Qy]

依赖 #57 已完成，#58 开始执行。冻结基线：main@1842769；按 SINGLE_OPERATOR_QA 检查 1440x900、1280x720、390x844、360x800，视觉缺陷不在本 QA PR 内顺手修复。