fix: honor zero rail width

[nrps9909]

Summary

• preserve an explicit railWidth={0} for line progress
• preserve the same value for circle progress
• cover both renderers with a regression test

Problem

Both renderers selected the rail width with railWidth || strokeWidth. Because zero is a valid numeric SVG stroke width, explicitly setting railWidth={0} was replaced by the track strokeWidth and the rail remained visible. Nullish fallback keeps the documented default behavior for omitted values while honoring zero.

Validation

• rc-test --runInBand (4 suites, 21 tests, 11 snapshots)
• tsc --noEmit
• ESLint on src/ (no errors; one existing unused-disable warning)
• Prettier and git diff --check

I checked the current issues and open PRs, including #214, whose Line.tsx change concerns zero-length subpath opacity rather than rail width. I found no duplicate for zero railWidth handling.

Summary by CodeRabbit

• Bug 修复

  • 修复进度条轨道宽度设置为 0 时被错误回退的问题。
  • Line 和 Circle 组件现可正确应用 railWidth={0}。

• 测试

  • 新增测试，验证轨道描边宽度为 0 时的显示结果。

[vercel]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.35%. Comparing base (2f59aea) to head (c47631d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #326   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files           7        7           
  Lines         156      156           
  Branches       52       52           
=======================================
  Hits          155      155           
  Misses          1        1           

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[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: f43ea6f0-9673-4026-9914-baf810447ace

📥 Commits

Reviewing files that changed from the base of the PR and between 2f59aea and c47631d.

📒 Files selected for processing (3)

• src/Circle/index.tsx
• src/Line.tsx
• tests/index.spec.js

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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Walkthrough

本次修改让 Line 和 Circle 在 railWidth={0} 时保留零值，并新增测试验证两个 rail 元素的 stroke-width 属性。

Changes

轨道宽度处理

Layer / File(s)	Summary
轨道宽度回退与零值验证 src/Circle/index.tsx, src/Line.tsx, tests/index.spec.js	Line 和 Circle 将 `railWidth

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to c4763

The change preserves an explicitly configured rail width of zero for line and circle progress while retaining defaults for omitted values, with regression coverage for both renderers. No actionable merge-blocking risk remains after normal checks and review.

Poem

小兔看见零轨道，
描边宽度不再逃。
Line、Circle 同步跑，
测试确认结果好。
空值才会用回退，
代码轻轻跳一跳。

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题“fix: honor zero rail width”准确概括了主要变更：Line 和 Circle 组件支持使用显式的 railWidth={0}，并且标题简洁明确。
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.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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