- New '/listing/:pubkey/:identifier' page: large gallery + lightbox, full
description, details, seller trust + trade reputation card, and full actions
(shared) for buyers and owners (mark sold/relist/delete)
- Extract ListingTradeActions (confirm/escrow request/ask-to-confirm/refund/
contact + escrow dialog) and use it in BOTH the grid card and the detail page
so there is one implementation
- useMarketplaceItem(pubkey, identifier) fetch hook
- Cards link their image + title to the detail page
- Smoke test covers /listing/:pubkey/:identifier
Gate: 101 tests, 0 errors/warnings, boot smoke green.
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