docs(landing): document data source blog thumbnails

[siisee11]

One-Line Summary

Document a reusable thumbnail pattern for future data source blog posts.

User-Facing Changes

• Adds a brand guide page for data source blog thumbnails with the expected canvas size, logo-card layout, heart treatment, asset rules, workflow, and checklist.
• Links the new thumbnail guide from the Blog section of brand-in-action.md.

Why This Changed

Future data source announcements need the same thumbnail shape, but the existing blog image guidance was generic and did not capture this specific partner-logo pattern. Without a reusable rule, each new source post could drift in logo treatment, spacing, heart shape, and text usage.

How It Changed

• Added apps/landing/docs/brand-guide/data-source-blog-thumbnails.md.
• Documented the 1254 x 1254 output, apps/landing/src/assets/blog/<post-slug>-icon.png location, MDX frontmatter reference, centered logo-card composition, exact OneQuery icon usage, provider logo rules, and validation checklist.
• Updated apps/landing/docs/brand-guide/brand-in-action.md to point data source posts to the new guide.

Extra Context / Decisions

• The guide says provider logos should use official source assets instead of image-generation redraws, because generated logos can drift from official marks.
• bun run format -- apps/landing/docs/brand-guide/data-source-blog-thumbnails.md apps/landing/docs/brand-guide/brand-in-action.md did not run because oxfmt has no matching Markdown targets.
• bun lint --format json currently exits with No files found to lint and zero diagnostics in this workspace.

Verification

• git diff --check

Video / Screenshot (Optional)

• N/A

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	onequery-landing	947ab7c	Commit Preview URL Branch Preview URL	Jun 22 2026, 08:51 AM