feat: update chart data description of group field

[hustcc]

• update chart data description of group field

[gemini-code-assist]

Summary of Changes

Hello @hustcc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the documentation for chart data structures by updating the description fields within the schema definitions. The primary goal is to provide clearer guidance and examples, especially concerning the use of the group field for various chart types that support data grouping or stacking. This change improves the developer experience by making it easier to understand and correctly format data for chart rendering.

Highlights

• Documentation Clarity: The descriptions for data structures across various chart types (area, column, line, radar, scatter, violin) have been significantly improved for better clarity.
• Group Field Usage Examples: Updated descriptions now include explicit examples and explanations for how to properly use the group field when data grouping or stacking is required for a chart.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.69%. Comparing base (abc9549) to head (7cd0ad4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   79.65%   79.69%   +0.04%     
==========================================
  Files          41       41              
  Lines        1784     1788       +4     
  Branches       31       31              
==========================================
+ Hits         1421     1425       +4     
  Misses        361      361              
  Partials        2        2              

Files with missing lines	Coverage Δ
src/charts/area.ts	100.00% <100.00%> (ø)
src/charts/column.ts	100.00% <100.00%> (ø)
src/charts/line.ts	100.00% <100.00%> (ø)
src/charts/radar.ts	100.00% <100.00%> (ø)
src/charts/scatter.ts	100.00% <100.00%> (ø)
src/charts/violin.ts	100.00% <100.00%> (ø)

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[gemini-code-assist]

Code Review

This pull request updates the data descriptions for several chart types to include information about the group field. The changes are consistent between the JSON schema files and the TypeScript Zod schemas. The new descriptions are more detailed and helpful. I've pointed out a few places where the examples in the descriptions use Chinese characters, which is inconsistent with the rest of the project. I've suggested using English examples for better consistency and maintainability.