Sync label documentation from G2: add overflowStroke transform and enhance exceedAdjust config

[Copilot]

Syncs incremental label documentation updates from antvis/g2 v5 to ant-design-charts, adding the new overflowStroke transform type and enhanced exceedAdjust configuration options.

Changes

English Documentation (label.en.md)

• Added overview, elements, and usage sections with visual examples
• Added configuration options table covering all label properties
• Added text & innerHTML section with React/Ant Design Charts examples

Chinese Documentation (label.zh.md)

• New overflowStroke transform: Adds stroke to overflowing labels for improved readability, similar to subtitle text with outline effect
  • Problem/solution examples with Column chart
  • Configuration table (threshold, palette)
• Enhanced exceedAdjust configuration:
  • Added bounds option ('view' | 'main') to control detection boundary
  • Added offsetX/offsetY for fine-tuned adjustment positioning
  • Split examples demonstrating view vs main boundary behavior with visual diagram

Code Example

// Before: only basic exceedAdjust
labels: [{ 
  text: 'price', 
  transform: [{ type: 'exceedAdjust' }] 
}]

// After: configurable boundary and offsets
labels: [{ 
  text: 'price', 
  transform: [{ 
    type: 'exceedAdjust', 
    bounds: 'main',  // Don't cover axis labels
    offsetX: 15       // Extra horizontal padding
  }] 
}]

// New overflowStroke for better overflow readability
labels: [{
  text: 'frequency',
  transform: [
    { type: 'contrastReverse' },
    { type: 'overflowStroke', threshold: 2 }
  ]
}]

All code examples adapted to use Ant Design Charts React components (Column, Line, etc.) instead of raw G2 Chart API.

Original prompt

将 http://github.com/antvis/g2/blob/v5/site/docs/manual/component/label.*.md 目录下的文档内容同步到 https://github.com/ant-design/ant-design-charts/blob/master/site/docs/options/plots/label.*.md 文件中。

同步要求：

1. 不能全量覆盖，同步增量内容即可
2. 示例代码仅同步配置（options），代码结构不要改动

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

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