feat: support allowClear tabIndex - #207

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Walkthrough

Input 和 TextArea 的 allowClear 对象配置新增可选 tabIndex。BaseInput 将该值应用于清除按钮。新增测试覆盖按钮状态、键盘导航、清除操作和重新渲染；README 补充配置说明。

Changes

清除按钮键盘导航

Priority: ⬇️ Low

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

Change: Feature

Suggested reviewers: zombiej

Merge Risk: ⚪ Minimal · up to ae84c

The allowClear tabIndex change is mergeable after normal checks.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		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 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		标题明确描述了本次变更的主要内容：为 allowClear 支持 tabIndex。
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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_{小兔带来一枚清除键，
Tab 轻轻跳过它身边。
Enter 按下，文字消散，
鼠标点击，焦点仍安然。
新添索引，文档写清，
键盘小路更分明。}

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

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.36%. Comparing base (507a041) to head (ae84cdc).

@@           Coverage Diff           @@
##           master     #207   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files          11       12    +1     
  Lines         428      428           
  Branches      134      137    +3     
=======================================
  Hits          421      421           
  Misses          7        7           

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