feat(ui): add Vercel connection guide

[siisee11]

One-Line Summary

Add a dedicated Vercel connection guide so users can create the right Access Token from the How to connect dialog.

User-Facing Changes

• Vercel now opens a full shared connection guide instead of falling back to generic catalog steps.
• The guide includes English and Korean instructions for token name, scope, expiration, copying the token, and team-scoped requests.
• The OneQuery dashboard includes sanitized Vercel token-form screenshots under /images/vercel.

Why This Changed

Vercel was a connectable Source API provider, but it was missing from the shared @onequery/ui connection guide registry. That left users with a short JSON-oriented fallback instead of the actual Vercel dashboard steps needed to create a usable token.

How It Changed

• Added vercelGuideContent to packages/ui/src/data-sources/connection-guides.
• Registered vercel in GUIDE_CONTENT and the shared guide provider union.
• Added dashboard public images for the Vercel token creation flow.

Bug Fixes

N/A

Verification

• bunx oxfmt packages/ui/src/data-sources/connection-guides/index.ts packages/ui/src/data-sources/connection-guides/types.ts packages/ui/src/data-sources/connection-guides/vercel.ts
• bun run typecheck from packages/ui

Video / Screenshot (Optional)

• Added sanitized screenshots in apps/dashboard/public/images/vercel/.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	onequery-landing	c126bd7	Commit Preview URL Branch Preview URL	Jun 23 2026, 08:22 AM