Add GitHub profile page with contributions, pinned repos, and activity feed

[stylessh]

Summary

• Adds a profile page at /<username> showing avatar, bio, metadata, followers, and a contribution graph banner with radial stagger animation
• Displays pinned repositories in a 2-column grid and a timeline activity feed with PR/issue cards, commit aggregation, and month grouping
• Extracts getPrStateConfig into a shared pr-state.ts helper for consistent PR icon/color across the app
• Server-side fetches profile, viewer, and pinned repos in the loader; contributions and activity load client-side with infinite query pagination
• Adds custom PenIcon, motion package, and userActivity cache policy (5min stale, 30min gc)

Test plan

• Navigate to /<your-username> and verify profile info, contribution graph animation, pinned repos, and activity feed render
• Verify "Load more" fetches additional activity pages
• Check PR cards show correct state icons (draft=gray, open=green, merged=purple, closed=red)
• Visit another user's profile and confirm public-only events are shown
• Verify PR rows on /pulls and PR detail pages still show correct state icons after the shared helper refactor

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	464b7e4	Commit Preview URL Branch Preview URL	Apr 12 2026, 02:27 AM