feat(notion-fetch): preserve notion spacers

[luandro]

Summary

• emit for empty Notion paragraphs so intentional spacers survive export
• trim leading/trailing spacer tokens and wire up DocSpacer MDX component
• cover the transformer with unit tests for empty, nested, and populated paragraphs

Testing

• bunx eslint scripts/notionClient.ts scripts/notionClient.test.ts src/components/DocSpacer/index.tsx src/theme/MDXComponents/index.tsx --fix
• bunx eslint scripts/notion-fetch/generateBlocks.ts --fix
• bunx vitest run scripts/notionClient.test.ts

Fixes #49

[luandro]

Summary

• map empty Notion paragraphs to <DocSpacer /> so intentional spacers survive the export
• trim spacer tokens off the top/bottom of generated markdown and add an MDX-wired DocSpacer component
• cover the transformer with unit tests alongside existing Notion client specs

Expected behavior

• Deliberate blank lines in Notion now render as controlled spacing in MDX/docs pages
• No stray spacer components appear at the start or end of generated markdown files

QA instructions

1. Run your usual Notion export pipeline (e.g., bun run notion:fetch) so new content is regenerated.
2. Inspect a page that previously used intentional blank lines—confirm the generated MDX now contains <DocSpacer /> entries instead of dropped spacing.
3. Start the docs locally with bun run dev, navigate to that page, and verify the vertical gaps render without extra spacers at the top or bottom.

[github-actions]

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[luandro]

Code Review Summary

What This PR Does

This PR implements a feature to preserve intentional spacing (empty paragraphs) from Notion in the generated documentation by:

• Creating a new <DocSpacer /> React component that renders adjustable vertical space
• Registering a custom transformer in the Notion-to-Markdown pipeline that detects empty paragraphs
• Emitting <DocSpacer /> tokens for empty paragraph blocks to survive the export process
• Trimming leading/trailing spacer tokens to avoid unnecessary whitespace at the start/end of documents
• Adding comprehensive unit tests for the transformer logic

How It Solves the Issue

The implementation uses a multi-layer approach:

1. Detection: hasVisibleRichText() function checks if a paragraph contains actual content by examining text, equations, and mentions
2. Transformation: n2m.setCustomTransformer() intercepts empty paragraphs during Notion-to-Markdown conversion and emits <DocSpacer /> tokens
3. Cleanup: trimEdgeDocSpacers() removes spacer tokens from document start/end to prevent layout issues
4. Rendering: The <DocSpacer /> component renders as a styled div with configurable sizes (sm/md/lg)

Potential Issues & Considerations

Strengths:

• ✅ Well-architected separation of concerns (detection, transformation, rendering)
• ✅ Comprehensive test coverage (44 lines of new tests) including edge cases (nested blocks, populated blocks)
• ✅ Proper handling of special content types (equations, mentions)
• ✅ Size flexibility with sm, md, lg options
• ✅ Integrates cleanly with Docusaurus via MDXComponents
• ✅ Non-breaking change - empty paragraphs were already being stripped, this just makes them explicit

Areas to Watch:

• ⚠️ Usage Pattern: Need to verify how content authors use empty paragraphs in Notion - are they actually intentional spacers or just artifacts? The implementation assumes intentional spacing
• ⚠️ Default Size: Uses "md" (1rem) as default - should this match the tighter spacing from PR fix(docs): align docs spacing with notion #51/57?
• ⚠️ MDX Requirement: Depends on MDX support - verified as working but worth noting this is an MDX feature
• ⚠️ Performance: Minimal impact, but the transformer runs on every paragraph (could be optimized with early returns if needed)

Code Quality:

• Clean TypeScript with proper typing
• Good test structure with descriptive test names
• Follows React best practices (aria-hidden, role=presentation)
• Proper cleanup logic with edge case handling

Testing:

• Unit tests cover empty, populated, and nested block scenarios
• Mocks properly configured for NotionToMarkdown
• All tests passing

Recommendation: ✅ Approve - Solid implementation with good test coverage. The feature enables intentional spacing preservation which improves parity between Notion authoring and published docs.

[luandro]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

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[luandro]

closed in favor of #65