feat(market): fix publish-duplicates, add offer detail page + filters

The vecino/market view had three gaps:

- Publishing inventory duplicated the listing. discover() appended every
  offer the relay streamed, but relays legitimately resend an addressable
  NIP-99 event (stored copy + live echo on publish). Merge by
  (authorPubkeyHex, id) so each offer appears once; two authors reusing a
  lot id stay distinct.
- No product detail. Tapping a card jumped straight to chat. Add a
  read-only "product page" (MarketOfferDetailScreen) with title, mode,
  category, eco badge, coarse location, price, a "Shared by" seller
  section (profile fetched by pubkey) and the message button. Reached via
  a new /market/offer route; cards are now fully tappable. Shows only what
  the network already carries — no photos/description added to the wire.
- No filters. Add a filter bar (type, category, eco) mirroring inventory,
  each chip group shown only when a discovered offer can match it. To make
  the eco filter real, publish the organic flag on the wire: Offer.isOrganic
  -> NIP-99 'organic' tag -> OfferMapper -> ShareableLot.

Tests: commons_core organic round-trip; app-side dedup, two-author
separation, filter logic, mapper passthrough; detail-screen widget tests.
i18n keys added to en/es/pt/ast and slang regenerated.

apps/app_seeds/lib/i18n/pt.i18n.json

@@ -374,7 +374,11 @@
     "rangeLabel": "Até onde procurar",
     "rangeNear": "Muito perto",
     "rangeArea": "Pela minha zona",
-    "rangeRegion": "A minha região"
+    "rangeRegion": "A minha região",
+    "sharedBy": "Partilhado por",
+    "noProfile": "Esta pessoa ainda não partilhou o seu perfil",
+    "copyId": "Copiar código",
+    "idCopied": "Código copiado"
   },
   "profile": {
     "title": "O teu perfil",