fix(notion): refine spacer transformer and spacing

[luandro]

Summary

• bind the paragraph fallback to the original NotionToMarkdown instance so other transformers keep working while empty blocks emit spacers
• update the Notion client tests to cover the new fallback path and verify spacer behavior against the original blockToMarkdown
• tune the spacer CSS to derive its height from the Docusaurus paragraph rhythm so Issue empty blocks use to add space between content are being ignored #49 / PR feat(notion-fetch): preserve notion spacers #52 matches Notion’s vertical spacing more closely

Testing

• bunx vitest run scripts/notionClient.test.ts (fails: registry returned 429 rate limit)

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https://chatgpt.com/codex/tasks/task_e_690b97ff619c8327a49d6b4637527aab

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[chatgpt-codex-connector]

Preserve nested indentation when delegating paragraph transform

The custom paragraphTransformer returns early for empty blocks and otherwise delegates to the original blockToMarkdown. However, the delegation at defaultParagraphToMarkdown(paragraphBlock as BlockObjectResponse) does not forward any of the extra arguments that NotionToMarkdown passes to custom transformers (e.g. the current nesting depth). As a result every non‑empty paragraph is rendered with a nesting level of 0, so paragraphs that appear inside list items, callouts, or other nested contexts lose their indentation in the generated Markdown. Accept the extra parameters (...args) and pass them along to defaultParagraphToMarkdown so nested paragraphs still render correctly.

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