fix: preserve zero-valued dropdown content and icons

[QDyanbing]

说明

• notFoundContent={0} 可以打开并显示空列表；menuItemSelectedIcon={0} 仅在选中项中显示。
• 统一选项 label 与单选值展示的可渲染/非空判断，保留现有空白字符串处理。
• 补充空列表、选中图标及零值选项标签测试。

验证

• npm test -- --runInBand（446 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

• 问题修复

  • 修正下拉空状态、选择图标和选项标签的显示判断，使 0 等有效内容能够正确显示。
  • 调整单选值及输入内容的空值处理，避免有效标签被错误清空。

• 测试

  • 新增测试，覆盖空状态内容、零值选择图标及零值标签的显示。

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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: 40e46780-39e3-4a85-85bb-dcf4e818767e

📥 Commits

Reviewing files that changed from the base of the PR and between 59dd34a and ae0f936.

📒 Files selected for processing (5)

• src/BaseSelect/index.tsx
• src/OptionList.tsx
• src/Select.tsx
• src/SelectInput/Content/SingleContent.tsx
• tests/renderability.test.tsx

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

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Walkthrough

本次更新调整选择器对零值和其他可渲染内容的判断，涉及下拉空状态、选项图标、选项标签及单选值显示。新增测试覆盖零值空状态、图标和选项标签。

Changes

可渲染内容处理

Layer / File(s)	Summary
下拉空状态判断 src/BaseSelect/index.tsx, tests/renderability.test.tsx	当选项为空且 notFoundContent 不可渲染时，设置空列表内容状态。新增测试验证 notFoundContent={0} 会显示 0。
选项与单选值显示 src/OptionList.tsx, src/Select.tsx, src/SelectInput/Content/SingleContent.tsx, tests/renderability.test.tsx	选项图标和标签改用可渲染性判断。单选值及内容区域改用非空值判断。新增测试验证零值图标仅显示于选中项，并验证零值标签显示在选项和已选值区域。

Priority: ⬇️ Low

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

Change: Bug fix

Suggested reviewers: afc163

Merge Risk: ⚪ Minimal · up to ae0f9

The changes preserve zero-valued dropdown content, icons, and labels. The inspected empty-label case still displays the option value, and no concrete merge-blocking issue 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	标题准确概括了本次变更的主要目标：保留下拉内容和图标中的零值。标题简洁、明确，并与代码和测试变更一致。
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 5…
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，蹦来看新判断
零值也能留在菜单上
空状态里，零字清亮
选中图标乖乖守在旁
我竖起耳朵，为测试鼓掌}

_{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 99.46%. Comparing base (59dd34a) to head (ae0f936).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1254      +/-   ##
==========================================
- Coverage   99.46%   99.46%   -0.01%     
==========================================
  Files          31       31              
  Lines        1307     1304       -3     
  Branches      477      452      -25     
==========================================
- Hits         1300     1297       -3     
  Misses          7        7              

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