Add search, sort, and filter system for list pages

[stylessh]

Summary

• Add a reusable FilterBar component with instant text search (by title, repo, author), sort dropdown (updated, newest, oldest, comments, title), and Linear-style two-level filter pills for Repository, Author, and Status fields
• Filters use AND logic across fields and OR within a field; pills show avatars for authors and colored icons for status, with stacked avatars and "+N selected" when more than 3 values are chosen
• Integrate into pulls, issues, and reviews pages — filters apply within each group and sidebar counts update to reflect filtered results
• Persist filter/sort state per page in a diffkit-filters cookie, read server-side in loaders to avoid SSR flash
• Export new icons (SortIcon, UserCircleIcon, Remove01Icon) from @diffkit/icons

Test plan

• Verify text search filters by title, repository name, and author login across all three pages
• Verify filter pills can be added, combined, and removed; values toggle correctly in the value picker
• Verify sort options work correctly for each sort type
• Verify filter state persists across page navigations and full page reloads (cookie persistence)
• Verify no SSR flash on reload with active filters
• Verify dropdown panels don't overflow the viewport on narrow layouts

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	7fef977	Commit Preview URL Branch Preview URL	Apr 11 2026, 04:40 AM