fix: preserve zero-valued column titles

[QDyanbing]

说明

• 列标题为 0 时，宽度测量单元格使用实际内容，不再用空白替代。
• 为零值列标题和分组标题生成正确的表头 scope，补充测量及无障碍属性测试。

验证

• npm test -- --maxWorkers=2（238 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
  • 标题为数字 0 时，现在也能正确显示；表头会按列结构设置对应的范围属性。

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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: 2d956613-d2da-4c59-a0a3-3c7db4033124

📥 Commits

Reviewing files that changed from the base of the PR and between e63fbf5 and 655813c.

📒 Files selected for processing (3)

• src/Body/MeasureCell.tsx
• src/Header/HeaderRow.tsx
• tests/renderability.spec.tsx

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Walkthrough

表头和测量单元格现在使用 isReactRenderable 判断标题是否可渲染。新增测试验证标题值为 0 时的渲染结果。

Changes

标题可渲染性

Layer / File(s)	Summary
标题渲染与验证 src/Header/HeaderRow.tsx, src/Body/MeasureCell.tsx, tests/renderability.spec.tsx	表头根据标题是否可渲染设置 scope，并继续依据 colSpan 选择 colgroup 或 col。测量单元格在标题不可渲染时显示不间断空格。新增测试验证零值标题文本和对应的表头范围属性。

Priority: ⬇️ Low

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 65581

Zero-valued titles are now retained in header and measurement cells with the expected header scopes. No actionable merge risk remains.

🚥 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	标题“fix: preserve zero-valued column titles”准确概括了主要变更：保留值为 0 的列标题，并支持相关单元格内容和表头 scope 正确渲染。标题简洁且明确。
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 3…
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 💡 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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_{我是小兔，带来一颗零，
表头把它清楚地呈现。
单元格里，零也不隐去，
测试轻轻点头说正确。
我蹦回草地，抱着胡萝卜。}

_{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 99.08%. Comparing base (e63fbf5) to head (655813c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1516   +/-   ##
=======================================
  Coverage   99.08%   99.08%           
=======================================
  Files          45       45           
  Lines        1426     1426           
  Branches      432      432           
=======================================
  Hits         1413     1413           
  Misses         13       13           

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