feat(turndown-plugin-gfm): adopt MD060 compact style for table cells

[yzx9]

Style compact avoids extra padding with a single space around cell content:

| Character | Meaning |
| --- | --- |
| Y | Yes |
| N | No |

Closes #8795

[gemini-code-assist]

Summary of Changes

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This pull request refactors the table rendering within the turndown-plugin-gfm package to adhere to the MD060 compact style. This change standardizes the spacing within Markdown table cells, particularly for empty cells, by reducing excessive padding. The primary goal is to improve the generated Markdown's readability and consistency with common linting practices.

Highlights

• Adopted MD060 Compact Style for Tables: The table generation logic in turndown-plugin-gfm has been updated to follow the MD060 compact style, which reduces extra padding around table cell content, especially for empty cells.
• Reduced Cell Padding: Empty table cells now use two spaces between pipes (e.g., | |) instead of five spaces (e.g., | |), aligning with the compact style.
• Updated Test Expectations: Relevant test files have been modified to reflect the new compact table cell formatting, ensuring consistency with the implemented style.

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Changelog

• apps/server/src/services/export/markdown.spec.ts
  • Updated expected Markdown output for tables to reflect the new compact cell styling.
• packages/turndown-plugin-gfm/src/lib/tables.js
  • Modified the emptyHeader generation to use two spaces for empty cells in the header divider.
  • Added a comment explaining the MD060 compact style for table cells.
  • Removed the while (filteredContent.length < 3) loop that added extra spaces to content.
  • Adjusted handleColSpan to use a single emptyChar for colspan padding instead of emptyChar.repeat(3).
• packages/turndown-plugin-gfm/test/index.html
  • Updated expected Markdown table outputs in various test cases to match the new compact cell formatting.

Activity

• The pull request description indicates that this change closes issue Markdown export: short table cells padded to 3 chars causing double spaces (MD060) #8795.

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Code Review

This pull request successfully implements a compact style for Markdown tables generated by the turndown-plugin-gfm package, adhering to the MD060 style guide rule. The changes correctly adjust padding for table cells, especially for empty cells and headers, by modifying the cell rendering logic. The associated test files have been updated to validate the new compact output. The implementation is focused and directly addresses the feature request.