fix: preserve zero-valued step content and icon styles

[QDyanbing]

说明

• 保留 itemRender 返回的 0，避免将有效内容替换成 null。
• icon={0} 正确标记自定义图标样式，补充零值与空值回归测试。

验证

• npm test -- --runInBand（30 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

• Bug 修复
  • 优化步骤项对自定义图标和渲染内容的处理，确保数字 0 可以正常显示；无效或空内容不会生成步骤内容。

[vercel]

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 1ff98441-7f86-46f5-9da2-c5abfef7afde

📥 Commits

Reviewing files that changed from the base of the PR and between 400f7cf and a697d2e.

📒 Files selected for processing (2)

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

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Walkthrough

Step.tsx 使用 isReactRenderable 判断 icon 和 itemRender 的返回值，并据此设置自定义图标类和步骤节点。新增测试覆盖数值、空值及布尔值等渲染情况。

Changes

步骤渲染值判断

Layer / File(s)	Summary
渲染值判断与测试 src/Step.tsx, tests/renderability.test.tsx	Step.tsx 使用 isReactRenderable 判断 icon 和 itemRender 的返回值。测试验证 itemRender 返回 0 时保留文本，返回 false、null、undefined 或空字符串时步骤内容为空，并验证 icon 为 0 时添加自定义样式类。

Priority: ⬇️ Low

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to a697d

Zero-valued step content is preserved and the requested icon styling is applied; no concrete user-facing issue is established that should block merging.

🚥 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 itemRender 返回的 0，并修复 icon={0} 的自定义图标样式判断。标题简洁且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

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_{兔子蹦到步骤旁，
看见零字亮晶晶。
图标虽小也显现，
空值退场不留影。
新测试本上画个圈，
月光下把萝卜分。}

_{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 100.00%. Comparing base (400f7cf) to head (a697d2e).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #399   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           97        98    +1     
  Branches        36        37    +1     
=========================================
+ Hits            97        98    +1     

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