feat: support show exact value

[dogledogle]

为 Ant Design Rate 精细显示需求提供 rc-rate 底层支持。

本改动用于实现 Ant Design #52986 提出的 Rate 只读模式展示体验优化，使组件能够准确展示 3.8、4.7、4.9 等非整星、非半星评分。

• 新增 showExactValue 布尔值 prop，仅在 disabled 状态下生效
• 补充示例及中英文 API 文档

Summary by CodeRabbit

• 新功能

  • 评分组件在禁用状态下支持按原始小数值精确显示评分，而不再仅显示整星或半星。
  • 新增 showExactValue 配置，默认关闭，并支持 RTL（从右到左）布局。

• 文档

  • 更新中英文 API 文档，并补充精确评分显示示例。

• 测试

  • 新增精确评分、RTL 布局及与半星配置兼容性的测试覆盖。

[vercel]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a3adf1fa-5a1e-4800-a0a5-d50a057a0c5a

📥 Commits

Reviewing files that changed from the base of the PR and between 82114f5 and ba5e167.

📒 Files selected for processing (6)

• README.md
• README.zh-CN.md
• docs/examples/simple.tsx
• src/Rate.tsx
• src/Star.tsx
• tests/simple.spec.js

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

Rate 新增 showExactValue 属性。禁用状态下，Star 按评分小数部分设置字符宽度。文档、示例和测试覆盖精确展示、RTL、交互模式及 allowHalf 组合。

Changes

Rate 精确评分展示

Layer / File(s)	Summary
API 属性与组件传递 src/Rate.tsx, src/Star.tsx	RateProps 和 StarProps 新增 showExactValue。Rate 默认关闭该属性，并仅在禁用状态下传递给 Star。
小数比例渲染 src/Star.tsx	Star 根据评分与索引计算小数比例，并为首层字符设置动态宽度。
示例、文档与行为验证 README.md, README.zh-CN.md, docs/examples/simple.tsx, tests/simple.spec.js	文档和 Disabled 示例增加精确评分说明。测试覆盖禁用、RTL、交互模式及 allowHalf 组合。

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to ba5e1

This localized change adds exact-value display support for disabled ratings; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: afc163

Sequence Diagram(s)

sequenceDiagram
  participant Rate
  participant Star
  participant RatingMarkup
  Rate->>Star: disabled && showExactValue
  Star->>RatingMarkup: 根据小数比例设置宽度
  RatingMarkup-->>Star: 渲染精确评分

Loading

Poem

我是小兔，带来精确星光，
三点八分，不再匆忙取整。
Star 量出八成宽，
RTL 方向也清晰明亮。
文档与测试排好队，
耳朵一抖，改动完成。

🚥 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新增 showExactValue 属性的主要变更，内容简洁且与代码、文档和测试改动一致。
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
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 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[nrps9909]

Approved exact head ba5e1673413471194634594f13e706980f267716.

I verified that showExactValue remains disabled by default and is gated to read-only Rate instances, while allowHalf retains its existing interactive behavior. The submitted repository scope passes 2/2 suites, 46/46 tests, and 7/7 snapshots. TypeScript and source lint also pass with zero errors (one unchanged useEffect dependency warning), and ESM, CJS, declaration, and Less compilation complete successfully.

A temporary independent matrix covered 0.1, 1.999999999, and 2.25 across RTL rendering, confirming the exact 10%, 99.9999999%, and 25% clip widths. A controlled rerender also verified that disabling showExactValue removes the dynamic width and half-state class instead of leaving stale exact-value presentation. All 4 added probes passed and were removed after validation.

The only remote failure is the fork Vercel authorization gate, not a source check.

Codex-assisted review: Codex traced the Rate/Star display precedence, ran the full repository and build validation, and executed the isolated boundary matrix in a detached exact-head worktree. No repository files were changed.