docs: tighten SEO descriptions across docs pages

[mintlify]

Summary

Rewrite frontmatter descriptions across the docs so each page hits the 130–160 character SEO sweet spot with unique, search-friendly summaries.

Changes

• Expanded short descriptions on 23 pages to 130–160 characters
• Made each description unique and specific to the page's content
• Included relevant keywords (e.g., framework names, feature names, API concepts) for better search snippets
• Left titles untouched — all were already under 60 characters and descriptive

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Project	Deployment	Actions	Updated (UTC)
marble-web	Ready	Preview, Comment	Jun 17, 2026 7:35pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
marble-app	Skipped		Jun 17, 2026 7:35pm

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Project	Status	Preview	Updated (UTC)
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