fix(web): 完善 Files 页面 i18n

[junxin367]

概述

• 补齐 Files 列表页、文件详情页、目录树未走 i18n 的文案
• 新增 Files 页面错误文案映射，统一为“中文前缀 + 原始错误详情”
• 中文下将 detached 显示为“游离 HEAD”，文件详情页 Diff tab 保留为 Diff
• 删除搜索空态里的不可达英文分支文案

原因

• Files 页面在中文环境下仍有多处英文直出
• 查询失败时会直接把英文 fallback / 原始错误暴露给用户

影响范围

• web/src/routes/sessions/files.tsx
• web/src/routes/sessions/file.tsx
• web/src/components/SessionFiles/DirectoryTree.tsx
• web/src/lib/files-i18n.ts
• web/src/lib/locales/en.ts
• web/src/lib/locales/zh-CN.ts

验证

• bun test web/src/lib/files-i18n.test.ts
• bun typecheck

风险 / 回滚

• 风险低；仅影响 Files 相关页面展示文案与错误提示
• 如需回滚，直接 revert 本 PR 即可

Reviewer Notes

• 重点看 web/src/lib/files-i18n.ts 的错误映射是否符合预期
• Diff 在中文下刻意保留英文
• detached 在中文下改为“游离 HEAD”

截图

• 无；本次仅文案与错误提示调整，无布局与交互改动

[github-actions]

Review mode: initial
1 finding. The Files error formatter can mangle combined staged/unstaged git-status failures; see the inline comment.
Testing: Not run (bun unavailable in runner)

[github-actions]

[Minor] This only handles one prefixed failure, but useGitStatusFiles can concatenate both diff errors into a single string (Unstaged ... Staged ...), so the second failure is folded into the translated detail and lost.

Suggested fix:

const segments = detail.split(/(?=Unstaged diff unavailable: |Staged diff unavailable: )/).filter(Boolean)
if (segments.length > 1) {
  return segments.map((segment) => {
    const unstaged = stripPrefix(segment, 'Unstaged diff unavailable: ')\n    if (unstaged) return t('files.changes.error.unstagedDiffUnavailableWithDetail', { error: unstaged })\n    const staged = stripPrefix(segment, 'Staged diff unavailable: ')\n    if (staged) return t('files.changes.error.stagedDiffUnavailableWithDetail', { error: staged })\n    return segment\n  }).join(' ')\n}\n```

[junxin367]

Fixed in 3417f90. formatGitStatusError now splits combined Unstaged ... Staged ... failures into segments and translates each one independently, so both errors are preserved. Added regression coverage in web/src/lib/files-i18n.test.ts.

[github-actions]

Findings
未发现需要阻塞合并的问题。

Summary

• Review mode: initial
• 已完整检查本次 Files 页面 i18n diff；剩余风险主要在浏览器端人工验证（语言切换后文件列表、目录树、文件详情页错误态展示）。

Testing

• Not run (automation: 当前 runner shell 中 bun 不可用，bun test web/src/lib/files-i18n.test.ts 与 bun typecheck 均无法启动)。

HAPI Bot