补齐企微历史验收模拟接口隔离（09-06-release-gate-integrity / 09-17-company-loan-principal-repayment）

N3 第三轮候选 98bab397：浏览器 371 通过、1 失败；报销付款与 PWA 升级通过。
桌面企微历史测试整页导航后等待标题超时，快照退回登录页。
确认默认桌面 context 漏掉已有的 Service Worker 隔离；原运行没有请求来源证据，历史唯一根因未证实。
补文件级隔离，验证原导航实际获得该 fixture 的 refresh/profile 响应：200、非 Worker、requestId 对应。
原三项用例、登录/会话、桌面只读、手机布局及截图保持。受管定向 3 项通过，无失败/跳过/重试，环境和清理通过。
应用、资金规则、迁移、门禁范围、预算和全局并发未改。前三轮失败回执保留。
第四轮完整候选结果以新回执为准；独立代码复核及真实还款待验。
仅本地提交，不推送、不部署，不访问生产或真实 OCR。

.trellis/spec/hyb-oa/frontend-react-vite-design.md

@@ -265,6 +265,7 @@ and verification contracts. Do not copy broad aesthetic guidance from
 - A spec that depends on Playwright route mocks must block Service Workers when
   it can run a PWA build. Do not rely on Service Worker installation or takeover
   timing to keep requests visible to `page.route`.
+- Cover both default `{ page }` fixtures and manually created contexts. A mobile `browser.newContext({ serviceWorkers: "block" })` does not protect the default desktop fixture; register full-navigation refresh/profile response witnesses before navigating and verify their synthetic source when diagnosing session loss.
 - Vite dev success is not equivalent evidence: the generated PWA worker is a
   production-build behavior and may be absent in dev.
 - Blocking the worker is a fixture boundary, not an authentication bypass. The