Use background highlighting for selection states

[alwaysmavs]

选择菜单使用圆点、勾选和手写选中标记，导致不同入口的反馈不一致。本次统一为主题背景高亮，同时保留选中状态的无障碍语义和键盘交互。

范围包含共用 DropdownMenu/Select/Checkbox，以及模型、Agent 模式、权限模式、任务排序、项目/分支、Skill 筛选、成员和澄清选项。移除选择装饰及占位空间，复选框以填充背景表示选中，并更新 UI 规范。

验证：前端测试 1,713 项通过；全项目类型检查、lint 通过；改动文件格式检查通过。已通过本地 Electron 开发应用检查连接筛选菜单，确认选中项显示背景且没有圆点。

AI review 复核：任务排序改用受控 DropdownMenuRadioGroup/RadioItem，选中状态仍用背景表示。Skill 筛选同步采用同样的单选语义。复选框增加不同的部分选中背景，并回归验证 mixed→checked→unchecked 的状态切换。

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📥 Commits

Reviewing files that changed from the base of the PR and between 15aa254 and f3d4319.

📒 Files selected for processing (5)

• docs/conventions.md
• src/components/app-shell/AppShellNavigationSidebar.tsx
• src/components/ui/checkbox.test.tsx
• src/components/ui/checkbox.tsx
• src/routes/Skills/SkillPageHeader.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/conventions.md

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Summary by CodeRabbit

• UI Updates
  • Selected items in menus, filters, and choice lists are highlighted with a filled background instead of a checkmark or other indicator.
  • Checked and indeterminate checkboxes use filled backgrounds while retaining their selection state and keyboard behavior.

Walkthrough

Selection menus and controls replace check or dot indicators with background styling. Menu and choice controls continue to expose selection through semantic state attributes. Checkbox conventions specify filled selection backgrounds and checked-box styling.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to f3d43

Task-sort selection now retains radio-menu semantics. No identified issue remains that should delay merging.

🚥 Pre-merge checks | ✅ 2 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title describes the main change but does not use the required <type>(<scope>): <subject> format.	Rewrite the title in the required format, for example: feat(ui): use background highlighting for selection states. The scope is optional, but the type and colon-separated subject are required.
Description check	⚠️ Warning	The description explains the change and reports verification results, but it omits the required ## Summary, ## Verification, and ## Safety and Compatibility structure and does not address the re…	Update the description to use the repository template. Add the required section headings, verification checklist status, runtime/UI verification status, and responses for BYOK/OOMOL, credential safety, agent tools and prompts, migration and…

✅ Passed checks (2 passed)

Check name	Status	Explanation
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.

Full details: Description check

Explanation

The description explains the change and reports verification results, but it omits the required ## Summary, ## Verification, and ## Safety and Compatibility structure and does not address the required safety checklist items.

Resolution

Update the description to use the repository template. Add the required section headings, verification checklist status, runtime/UI verification status, and responses for BYOK/OOMOL, credential safety, agent tools and prompts, migration and packaging impact, documentation, and tests.

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/components/app-shell/AppShellNavigationSidebar.tsx:
- Around line 238-241: Update the task-sort choices in AppShellNavigationSidebar
to use radio-menu semantics: wrap the options in a controlled
DropdownMenuRadioGroup using taskSortMode and onSetTaskSortMode, and render each
choice as a DropdownMenuRadioItem instead of a DropdownMenuItem with
aria-checked.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: f51a1d35-787e-4f57-948e-c873690ac6b8

📥 Commits

Reviewing files that changed from the base of the PR and between 4444120 and 15aa254.

📒 Files selected for processing (13)

• docs/conventions.md
• src/components/app-shell/AppShellNavigationSidebar.tsx
• src/components/app-shell/ProjectContextBar.tsx
• src/components/ui/checkbox.tsx
• src/components/ui/dropdown-menu.tsx
• src/components/ui/select.tsx
• src/components/ui/selection-menu.test.tsx
• src/routes/Chat/AgentConfigurationPicker.tsx
• src/routes/Chat/AgentModePicker.tsx
• src/routes/Chat/PermissionModePicker.tsx
• src/routes/Chat/QuestionPromptCard.tsx
• src/routes/Skills/SkillPageHeader.tsx
• src/routes/Skills/TeamMemberDialogs.tsx

💤 Files with no reviewable changes (1)

• src/routes/Skills/SkillPageHeader.tsx

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