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fix(pwa): disable navigation preload and serve cached static app shell on handoff - #79
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变更说明
public/sw.js升级激活阶段显式禁用浏览器导航预加载（navigationPreload.disable()）并移除preloadResponse，修复 iOS WebKit 在 Wi-Fi 切换蜂窝网络时底层预加载请求挂在失效连接上无法被AbortController中止、进而通过 HTTP/2 连接复用堵住后续同源探活请求的问题。sw.js，在线访问时缓存纯静态首页壳与带哈希的/assets/*脚本样式字体，切网握手超时或断网时直接秒开应用主界面壳，同时严格保持/api/*只走网络不写入缓存，登录重定向时自动驱逐本地首页壳缓存。App.tsx与report-building.ts为首次断网读取增加联网事件触发与 3 秒自动恢复探测，网络恢复后一并刷新归档与同步状态查询，重新登录前清理本地前端壳缓存并预留完整认证超时窗口。0.16.7版本。验证结果
bun run test全量 85 个测试文件 628 项测试通过。tests/pwa.browser.ts真实 Chromium 离线回退静态界面壳、冷缓存离线兜底页与联网自动恢复验收通过。bun run build、bunx prettier --check与git diff --check通过。