Add repository overview page at /<owner>/<repo>

[stylessh]

Summary

• Adds the repo overview page (/<owner>/<repo>) with code explorer (file tree, branch selector, clone popover), markdown file preview tabs, latest commit bar, and a metadata sidebar (about, topics, stats, details, contributors)
• Aggressively caches repo metadata (30min stale, 24h gc) and prefetches tree + markdown content in the route loader so revisits load instantly from cache
• Registers repo pages as dashboard tabs with org avatar, enabling webhook-based background revalidation via repoCode signals on push events
• Updates shared UI: segmented-control tabs style, removes command item roundness, adds ArchiveIcon to icon package

Test plan

• Navigate to /<owner>/<repo> and verify file tree, branch selector, clone popover, markdown tabs, and sidebar all render correctly
• Switch branches and confirm tree + markdown content updates
• Verify repo tab appears in dashboard tab bar with org avatar and owner/repo label
• Revisit the page and confirm data loads instantly from cache
• Push a commit to the repo and verify background revalidation updates tree/file content

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	a361d8c	Commit Preview URL Branch Preview URL	Apr 12 2026, 07:38 PM