fix: preserve zero-valued step handlers

[QDyanbing]

说明

• 上下调节按钮的自定义内容为 0 时保留该内容，不再回退到默认图标。
• 补充零值按钮显示、增加和减少数值的交互测试。

验证

• npm test -- --runInBand（188 项通过）
• npm run tsc
• 改动源码 ESLint 检查通过。

关联 ant-design/ant-design#59193

Summary by CodeRabbit

• 修复
  • 修正内容渲染行为：数字 0 等有效内容不再被内部占位元素替换。
  • 修复数字输入框的加减按钮显示为 0 时无法正常交互的问题；点击后会正确触发数值变化。

[vercel]

@QDyanbing is attempting to deploy a commit to the afc163's projects Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: ce52bce1-1759-4f75-a775-5d343b50541e

📥 Commits

Reviewing files that changed from the base of the PR and between 2e4c1b7 and 0e00745.

📒 Files selected for processing (2)

• src/StepHandler.tsx
• tests/renderability.test.tsx

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.

---

Walkthrough

StepHandler 现在使用 isReactRenderable 判断子元素是否可渲染。不可渲染时仍渲染内部占位 span。新增测试验证 InputNumber 的零值步进处理器显示为 0，并触发预期的数值更新。

Changes

步进处理器可渲染性

Layer / File(s)	Summary
可渲染性判断与零值测试 src/StepHandler.tsx, tests/renderability.test.tsx	StepHandler 使用 isReactRenderable 判断子元素是否可渲染。测试验证 upHandler 和 downHandler 为 0 时按钮显示 0，增加和减少操作分别使 onChange 最近一次收到 3 和 2。

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to 0e007

The change preserves zero-valued step handlers, and the supplied tests cover their display and interactions. No actionable merge risk is established by the available evidence.

🚥 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 2 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	标题准确概括了主要变更：保留值为 0 的 step handlers。标题简洁、明确，并与代码和测试变更一致。
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 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{兔子轻点步进键，
零也稳稳显眼前。
加后数值来到三，
减后回到二身边。
可渲染内容各安然。}

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.16%. Comparing base (2e4c1b7) to head (0e00745).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
+ Coverage   96.14%   96.16%   +0.02%     
==========================================
  Files           6        6              
  Lines         363      365       +2     
  Branches      102      105       +3     
==========================================
+ Hits          349      351       +2     
  Misses         14       14              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.