feat: add generate_spreadsheet

[Alexzjt]

generate_spreadsheet: Generate a spreadsheet or pivot table for displaying tabular data. When 'rows' or 'values' fields are provided, it renders as a pivot table (cross-tabulation); otherwise, it renders as a regular table.

https://mdn.alipayobjects.com/one_clip/afts/img/cWxHRKbU9v4AAAAAQpAAAAgAoEACAQFr/original

[gemini-code-assist]

Summary of Changes

Hello @Alexzjt, 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 significantly enhances the server's data visualization capabilities by integrating a new generate_spreadsheet tool. This tool offers flexible data presentation, allowing users to generate both standard tables and pivot tables from structured data. The changes span across the codebase, from core implementation and schema definition to comprehensive documentation and test updates, ensuring the new feature is fully supported and correctly integrated.

Highlights

• New Feature: Spreadsheet Generation: Introduced a new generate_spreadsheet tool that can render tabular data as either a regular table or a pivot table, depending on whether 'rows' or 'values' fields are provided.
• Documentation and Test Updates: The README.md has been updated to reflect the new chart count (26+) and include a description of the generate_spreadsheet tool. Corresponding test files (__tests__/api.spec.ts, __tests__/server.spec.ts, __tests__/charts/index.ts) have been adjusted to recognize and validate the new tool.
• Schema Definition and Implementation: A new file src/charts/spreadsheet.ts defines the input schema for the spreadsheet tool using zod, specifying parameters like data, rows, columns, values, theme, width, and height. A corresponding test fixture __tests__/charts/spreadsheet.json was also added.
• Dependency Update: The package.json file now includes ts-node as a development dependency.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.57%. Comparing base (d008ab8) to head (bc15cc6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   81.02%   81.57%   +0.54%     
==========================================
  Files          42       43       +1     
  Lines        1982     2041      +59     
  Branches       31       31              
==========================================
+ Hits         1606     1665      +59     
  Misses        374      374              
  Partials        2        2              

Files with missing lines	Coverage Δ
src/charts/index.ts	100.00% <100.00%> (ø)
src/charts/spreadsheet.ts	100.00% <100.00%> (ø)
src/utils/callTool.ts	38.46% <100.00%> (+0.68%)	⬆️

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[gemini-code-assist]

Code Review

This pull request introduces a new generate_spreadsheet tool, which is a great addition to the server's capabilities. The implementation is clean and follows the existing project structure. My review focuses on improving the clarity and correctness of the new tool's API schema. I've identified that allowing undefined as a value type in the input data can be problematic for JSON-based consumers and have provided suggestions in src/charts/spreadsheet.ts to align the schema with JSON best practices. These changes will make the API more robust and easier to use correctly. Overall, this is a solid contribution.

[hustcc]

@copilot 参考 tests/charts/spreadsheet.json 的 json schema 给 .skills/chart-visualization 增加 spreadsheet 的支持，主要有几个事情：

1. SKILL.md 增加 generate_spreadsheet
2. references 中增加 generate_spreadsheet 的知识库
3. skill 中的一些描述，涉及到 “25 个工具” 的文案 改成 “26 个工具”

[Copilot]

@hustcc I've opened a new pull request, #256, to work on those changes. Once the pull request is ready, I'll request review from you.