adventure: fix owner gear regression and drop em-dashes from equip copy

Show the public Gear panel whenever the owner's Equipment panel won't
render (no pushed Slots), so an owner whose detail predates ask 7 still
sees their standard gear instead of a blank. Replace em-dashes in the
equip feature's user-facing strings with plain commas.

internal/web/equip.go

@@ -129,7 +129,7 @@ func (s *Server) handleEquipOrder(w http.ResponseWriter, r *http.Request) {
 			// The web offers the next tier only; a request for anything else is a stale
 			// page or a forged jump. Refuse rather than debit for a tier the owner never
 			// saw priced.
-			writeEquipError(w, http.StatusConflict, "that upgrade is out of date — reload the page")
+			writeEquipError(w, http.StatusConflict, "that upgrade is out of date, reload the page")
 			return
 		}
 		itemName, slot, tier = sv.NextName, sv.Slot, sv.NextTier
@@ -148,7 +148,7 @@ func (s *Server) handleEquipOrder(w http.ResponseWriter, r *http.Request) {
 		writeEquipError(w, http.StatusInternalServerError, "internal error")
 		return
 	} else if n >= equipBurstMax {
-		writeEquipError(w, http.StatusTooManyRequests, "slow down — too many changes in a short while")
+		writeEquipError(w, http.StatusTooManyRequests, "slow down, too many changes in a short while")
 		return
 	}