fix: preserve min width for numeric popup width

[QDyanbing]

背景

popupMatchSelectWidth 传入 number 时，历史行为和文档语义都是下拉框宽度不应小于触发器宽度，即实际宽度应为 max(popupMatchSelectWidth, triggerWidth)。

在使用 @rc-component/trigger 的 stretch 逻辑后，number 场景会跳过 stretch，只保留 width: popupMatchSelectWidth，导致当传入值小于选择器宽度时，下拉框会被固定成更窄的宽度。

修改

• number 场景下将 stretch 设置为 minWidth，让 trigger 继续补充触发器宽度作为最小宽度。
• 保留现有 width: popupMatchSelectWidth，因此传入值大于触发器宽度时仍按自定义宽度展示。
• 增加测试覆盖 popupMatchSelectWidth 为 number 且小于触发器宽度的场景。

验证

• npm test -- tests/Select.test.tsx
• npm test -- tests/Select.test.tsx -t "dropdownMatchSelectWidth"
• npm run tsc
• npm run lint（仅存在既有 warning，无 error）

Summary by CodeRabbit

• Bug Fixes
  • 修复了下拉触发宽度在传入数字配置时的计算行为，使其与“最小宽度”逻辑保持一致。
  • 优化了下拉菜单在不同宽度配置下的展示效果，避免出现宽度表现不一致的问题。

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e708d3f3-34aa-45ce-a7ec-cdf24313b21d

📥 Commits

Reviewing files that changed from the base of the PR and between 1169cb8 and 71e03e0.

📒 Files selected for processing (2)

• src/SelectTrigger.tsx
• tests/Select.test.tsx

---

Walkthrough

调整了 SelectTrigger 中 popupMatchSelectWidth 的 stretch 计算规则，并新增测试覆盖数字参数时的下拉宽度与 stretch 值。

Changes

Select 弹层宽度处理

Layer / File(s)	Summary
stretch 逻辑调整 src/SelectTrigger.tsx	popupMatchSelectWidth 为 false 或数字时，stretch 统一返回 minWidth；其他情况仍返回 width。
数字宽度测试 tests/Select.test.tsx	新增用例验证 popupMatchSelectWidth=500 时，下拉样式同时具备 minWidth: 1000px 和 width: 500px，并断言 stretch 为 minWidth。

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• zombieJ

Poem

兔耳一抖风儿轻，
下拉宽度更分明。
数字一来不再躲，
minWidth 先把门撑平。
🐇

🚥 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修改的核心：修复数字型 popupMatchSelectWidth 时对最小宽度的保留。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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Warning

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🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

src/SelectTrigger.tsx

ESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox.

tests/Select.test.tsx

ESLint skipped: the ESLint configuration for this file references a package that is not available in the sandbox.

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[gemini-code-assist]

Code Review

This pull request updates the stretch calculation in SelectTrigger.tsx to return 'minWidth' instead of null when popupMatchSelectWidth is a number. It also adds a test case in tests/Select.test.tsx to verify that the dropdown menu width is not smaller than the trigger when popupMatchSelectWidth is configured as a number. I have no feedback to provide.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.44%. Comparing base (1169cb8) to head (71e03e0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1228      +/-   ##
==========================================
- Coverage   99.44%   99.44%   -0.01%     
==========================================
  Files          31       31              
  Lines        1265     1263       -2     
  Branches      441      440       -1     
==========================================
- Hits         1258     1256       -2     
  Misses          7        7              

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