fix(i18n): 语言轨导航修复+重排，热力图切 GitHub（车道 E）

- 真 bug（用户实测：切 en 后点板块回中文）：Header nav href 硬编码
  zh 路径，curLocale 只喂了词条——localeOf(Astro.url) 构建期自推断
  +五项+品牌链接全轨化（brand 原指 / 同病同修），aria 同步
- 导航重排（用户拍板）：开源 · 文章 · 图库 · 瞬间 · 关于；瞬间
  新进导航；移动 320-430×双轨八格页面级溢出全 0（内滚阈值 350→450
  +中段地板再收；en 390-430 尾部约 55px 靠内滚——'Open Source'→
  'Projects' 改名可省 35px，留用户拍板）
- 热力图纯切 GitHub（用户拍板）：GraphQL contributionsCollection
  53 周窗口（上海日界）；token=宿主 0600 github-token.txt，缺位→
  WARN 降级样例数据（当前站点即样例）；三级回落 token→样例→空网格
- E2E 新增 2 断言：en 页 nav 全 /en/ 前缀+brand 指 /en/（本 bug
  的回归测试）

车道：op-gitea（自验 33/33）；收编验收：en/zh 序实测+三宽度溢出 0+
E2E 33/33（本地 dist 口径——staging 未含未推代码为既定纪律）

验证: pnpm astro build 34 页 exit 0；node tests/e2e.mjs 33/33；
      en/zh 导航序与 href 前缀 playwright 实测

Spec: none (Header 修复+重排+热力图换源，车道级交付)

Co-authored-by: GLM-5.3

src/data/heatmap-fallback.json

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