fix: keep route scope tabs visible

[awsl233777]

Summary

• keep the global/project scope tab bar visible even when projects are still loading or the project list is empty
• show a stable Projects placeholder instead of removing the whole scope row
• reset the selected route scope back to Global if the previously selected project no longer exists

Validation

• cd web && pnpm typecheck && pnpm lint
• git diff --check

Notes

• This is separate from feat: add strict support-model routing toggle #789 so the support-model routing toggle PR stays focused.
• CodeRabbit was not checked or requested.

Summary by CodeRabbit

• 新功能
  • 项目查询期间新增加载状态提示。
  • 当当前选中的项目被删除时，自动回退至全局项目。
  • 路由标签栏始终显示：无项目时展示加载中或暂无项目提示，并保留排序按钮。
  • 有可用项目时显示对应的项目标签。
• 界面优化
  • 项目悬浮面板仅在存在项目时显示，避免无内容面板占位。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 659b6464-21b8-4189-9c4b-faf05f7dbcf4

📥 Commits

Reviewing files that changed from the base of the PR and between df88cf9 and 86ed86d.

📒 Files selected for processing (1)

• web/src/pages/client-routes/index.tsx

📜 Recent review details

⏰ Context from checks skipped due to timeout. (4)

• GitHub Check: Backend Checks
• GitHub Check: Frontend Checks
• GitHub Check: playwright
• GitHub Check: e2e

🔇 Additional comments (1)

web/src/pages/client-routes/index.tsx (1)

147-147: LGTM!

Also applies to: 176-185, 305-370

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📝 Walkthrough

Walkthrough

项目路由页面新增项目加载状态和选择有效性校验。导航标签栏始终显示，并区分加载中、无项目和有项目状态。悬浮项目面板仅在存在项目时显示。

Changes

项目路由状态与导航

Layer / File(s)	Summary
项目状态与选择回退 web/src/pages/client-routes/index.tsx	读取 isProjectsLoading。当已选项目不存在且当前选择不是全局项目时，重置为全局项目。
项目导航显示 web/src/pages/client-routes/index.tsx	始终渲染导航区域。无项目时显示加载或空项目提示，并保留排序按钮。有项目时显示全局和项目标签。项目悬浮面板仅在存在项目时渲染。

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• awsl-project/maxx#151：引入了 client-routes/index.tsx 的项目路由标签界面。
• awsl-project/maxx#276：同样修改了项目标签栏和悬浮面板逻辑。
• awsl-project/maxx#718：同样修改了项目标签显示和项目选择处理。

Poem

小兔看到标签栏，
加载时刻不隐藏。
项目删除有回退，
空空页面也清爽。
排序按钮仍在旁，
蹦跳庆祝改动忙。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了路由范围标签栏始终可见这一主要变更。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-route-scope-bar-visibility

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