style(anchor): stabilize marker positioning during panel expansion

[SonyLeo]

变更说明

• 优化 Anchor 面板、列表项与 tooltip 的间距定位。
• 使用 CSS 变量统一管理面板和目录项间距。
• 将 marker 改为相对列表项绝对定位。
• 修复右侧 Anchor 在收起态展开时 marker 向左移动的问题。
• 调整收起态目录项内边距，避免窄宽度下发生横向溢出。

验证

• Prettier 格式检查通过
• ESLint 检查通过
• vue-tsc 类型检查通过

截图对比

修改前

修改后

Summary by CodeRabbit

Style

• Refined anchor navigation layout and spacing for improved alignment.
• Standardized surface, item, and tooltip spacing with configurable styling values.
• Improved marker positioning and expanded-state presentation.
• Adjusted list padding, inline margins, and surface borders for a cleaner appearance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 9b13032b-9dcd-48d6-8f5a-77a437615335

📥 Commits

Reviewing files that changed from the base of the PR and between 055fb38 and 286737f.

📒 Files selected for processing (1)

• packages/components/src/anchor/components/AnchorItem.vue

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The anchor components now use shared CSS custom properties for surface padding, item padding, tooltip gaps, and marker positioning. List spacing and expanded or collapsed item layouts use the updated values.

Changes

Anchor layout

Layer / File(s)	Summary
Surface spacing variables packages/components/src/anchor/components/AnchorOverlay.vue, packages/components/src/anchor/components/AnchorList.vue	The overlay defines shared spacing variables. The surface uses variable horizontal padding, and the list uses a matching negative inline margin without vertical padding. Expanded surfaces no longer apply the anchor border.
Item and marker positioning packages/components/src/anchor/components/AnchorItem.vue	Items use variable padding and tooltip gaps. Collapsed items remove inline padding. Marker slots use absolute positioning and calculated horizontal offsets.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 28673

This updates Anchor spacing and marker positioning, including collapsed-item hit-area handling. No unresolved merge-readiness risk remains.

Suggested reviewers: gene9831

🚥 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	The title clearly summarizes the main change: stabilizing Anchor marker positioning during panel expansion. It is concise and specific.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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 unit tests (beta)

• Create PR with unit tests

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_{A rabbit hops where anchors align
Shared spacing keeps the paths in line
Markers rest with gentle care
Padding shifts through CSS air
Expanded leaves and collapsed bends
Neat little layouts meet their ends}

_{Comment @coderabbitai help to get the list of available commands.}

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[github-actions]

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commit: 286737f

[gene9831]

发现 1 个需要修正的交互回归：收起态目录项的按钮命中区域由原先约 30px 缩小到 16px。具体复现和修改建议见行内评论。

已在 PR Preview 验证左右 placement、hover/manual 收起态以及 360px 视口；marker 定位稳定，未发现额外横向溢出。当前 CI build、e2e 和 package preview 均通过，但仓库没有 Anchor 专项测试覆盖该命中区域。