test(shared): hubClientTransportRun/Catch + testing/i18n 补 116 个单元测试（Lane D #1764 第九批）

[DeliciousBuding]

Summary

延续 #1765–#1777，落地 Lane D 前端测试补债 (#1764) 第九批：给 3 个模块补 116 个单元测试。不改任何产品代码。

为什么选它

• hubClientTransportRun.ts（413 行）：run 传输流编排（refresh-recovery 门控、TIMEOUT/NETWORK 重映射、route-fallback）——全部经注入 fetchImpl 测试，100% 行/分支/函数覆盖。
• hubClientTransportCatch.ts（423 行）：catch 分类/决策/效果编排 + abort 超时计时器生命周期。
• testing/i18n.ts（171 行）：测试专用 i18n 工具（createTestI18n/installTestI18n），此前零覆盖。

覆盖范围

• transportRun（+47）：fetchHubJson/Multipart、runHub* 系列、createHubClientTransport、refresh 恢复门控（非 401/缺 handler/空 token/refresh 抛错/重试抛错）、route-fallback（404/405 继续、500/网络重抛、耗尽重抛）、30s 默认超时
• transportCatch（+34）：19 导出全量、abort 计时器清理（成功/失败均清）、classify/resolve/plan 4 分支、exactOptional 包装、空串 token 中止重试
• testing/i18n（+35）：默认值/语言选择/资源合并/回退 false/实例隔离/useTestI18nLanguage/重复 install

Test plan

• vitest run 新文件 — 116/116 通过
• tsc --noEmit 全包 0 错误
• CI 前端测试 job 通过

关联

• 里程碑：简化做减法 · Simplify & Slim Down (Do not dispatch agent tasks with the HTTP request context #100)
• Lane D 测试补债：[P1] 前端测试补债：shared/workbench 核心 store/hook/util 单元测试 #1764（第九批）
• real_tested=true：注入 fetchImpl 真实逻辑测试；仅 spy console/globalErrorReporter + fake timers

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📥 Commits

Reviewing files that changed from the base of the PR and between 86e1ddd and 96e86b3.

📒 Files selected for processing (3)

• app/shared/src/hub/hubClientTransportCatch.test.ts
• app/shared/src/hub/hubClientTransportRun.test.ts
• app/shared/src/testing/i18n.test.ts

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