feat(auctions)!: consume cursor-paginated list endpoints (BV-029)

[subhanlone]

Summary

• Adapts every frontend consumer of the six backend endpoints that BV-029 (bidvault-backend#7) converted to cursor pagination — GET /auctions, /watchlist, /auctions/mine/bids, /auctions/{id}/bids, /listings/mine, /listings/pending — to the new {items, nextCursor} response shape.
• Browse Auctions gets genuine lazy loading: useInfiniteQuery + an IntersectionObserver sentinel (useInfiniteScrollTrigger), with category/search moved server-side into the query key so pagination never silently hides a match on an unloaded page.
• Every other paginated screen (My Bids, Watchlist, My Listings, the admin Listing Review queue, dashboard/sidebar stat badges) shows an exact count or aggregate, so those drain every page up front — a new useDrainedPages hook for the TanStack Query consumers, an inline cursor walk for the three plain-useState ones (usePendingListings, SellerMyListings, SellerProfile/SellerDashboard) — rather than exposing pagination UI where correctness of a total depends on having loaded everything.
• Regenerated src/types/openapi.d.ts from the backend's BV-029 contract (api:contract && api:types).

Test plan

• npm run build — clean
• npm run lint — 0 errors
• Backend tests/pagination.test.ts (7 tests) + full suite verify the underlying cursor contract this PR consumes
• Verified via curl against a local dev backend that /auctions?status=ACTIVE&limit=24 returns exactly 24 items + a nextCursor when more exist, and nextCursor is null once exhausted
• Manual browser check of the infinite-scroll UX on Browse Auctions — not done this session, the Claude-in-Chrome extension was disconnected; please click through before merging (scroll to the bottom of Browse Auctions with 25+ active auctions seeded and confirm the next page loads)

Merge order

Depends on bidvault-backend PR #7 (fix/bv-029-pagination) being on master first — this branch's openapi.d.ts was generated from that PR's contract.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01WBf5EWVmeLL4uXWVTFmgwG

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Project	Deployment	Actions	Updated (UTC)
bidvault	Ready	Preview	Aug 31, 2026 7:36am