feat(bell): dedicated Trades tab

The bell had All/Social/News/Crews; trade steps were only inside All. Added a
5th tab (Handshake, orange accent) listing offers, counter-offers, outcomes and
trade confirmations, with its own count. All still shows them first.

AGENTS.md

@@ -89,7 +89,13 @@ session with **no other memory of this project**. So:
   → "Marketplace Offers". Trade/offer steps also feed **`useTradeNotifications`**
   → the bell's **All** tab (`TradeNotificationCard`, counted in the badge against
   `seenAt`) and OS notifications (new **`trades`** category in `notificationPrefs`,
-  wired in `OsNotificationBridge`).
+  wired in `OsNotificationBridge`). The bell also has a dedicated **Trades tab**
+  (5th tab, `Handshake`) listing them, with its own count. **Barter is supported
+  by design**: trade attestations carry `method` (`cash|lightning|trade|other` —
+  `MarkSoldDialog` picks it), so a swap feeds reputation exactly like a sale; an
+  offer with **no `amount`** plus a note is how a swap is proposed (there is
+  deliberately **no** "For trade" listing type yet — `LISTING_TYPES` is
+  `selling|wtb`).
 - **Cashu escrow** (marketplace): time-locked **P2PK** (lock to seller + buyer
   refund key + locktime) — see **`ESCROW.md`** and `src/lib/cashuEscrow.ts`
   (unit-tested). Protocol: `cashu_token` on the `31872`; each user advertises a

src/components/NotificationBell.tsx

@@ -1,7 +1,7 @@
 import { useEffect, useMemo, useState } from 'react';
 import { Link } from 'react-router-dom';
 import { nip19 } from 'nostr-tools';
-import { Bell, Users, Check, Loader2, EyeOff, Globe, CheckCheck, Heart, Radio, ArrowRight } from 'lucide-react';
+import { Bell, Users, Check, Loader2, EyeOff, Globe, CheckCheck, Heart, Radio, ArrowRight, Handshake } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
 import { ScrollArea } from '@/components/ui/scroll-area';
@@ -347,7 +347,7 @@ export function NotificationBell({ className }: { className?: string }) {
         </div>
 
         <Tabs defaultValue="all" className="flex min-h-0 w-full flex-1 flex-col">
-          <TabsList className="grid w-full shrink-0 grid-cols-4 rounded-none border-b border-white/10 bg-transparent p-0">
+          <TabsList className="grid w-full shrink-0 grid-cols-5 rounded-none border-b border-white/10 bg-transparent p-0">
             <TabsTrigger
               value="all"
               className="rounded-none border-b-2 border-transparent py-2.5 text-xs font-bold data-[state=active]:border-teal-400 data-[state=active]:bg-transparent data-[state=active]:text-teal-400"
@@ -355,6 +355,13 @@ export function NotificationBell({ className }: { className?: string }) {
               All
               {badgeTotal > 0 && <span className="ml-1 text-teal-400">{badgeTotal}</span>}
             </TabsTrigger>
+            <TabsTrigger
+              value="trades"
+              className="rounded-none border-b-2 border-transparent py-2.5 text-xs font-bold data-[state=active]:border-[#ff6600] data-[state=active]:bg-transparent data-[state=active]:text-[#ff6600]"
+            >
+              <Handshake className="mr-1 h-3 w-3" /> Trades
+              {tradeNotifs.length > 0 && <span className="ml-1 text-[#ff6600]">{tradeNotifs.length}</span>}
+            </TabsTrigger>
             <TabsTrigger
               value="social"
               className="rounded-none border-b-2 border-transparent py-2.5 text-xs font-bold data-[state=active]:border-teal-400 data-[state=active]:bg-transparent data-[state=active]:text-teal-400"
@@ -430,6 +437,28 @@ export function NotificationBell({ className }: { className?: string }) {
               </div>
             </TabsContent>
 
+            {/* ─── TRADES (offers, counter-offers, confirmations) ──────── */}
+            <TabsContent value="trades" className="m-0 p-3">
+              {tradeLoading && tradeNotifs.length === 0 && (
+                <div className="flex items-center justify-center gap-2 py-8 text-sm text-gray-500">
+                  <Loader2 className="h-4 w-4 animate-spin" /> Checking offers and trades…
+                </div>
+              )}
+              {!tradeLoading && tradeNotifs.length === 0 && (
+                <EmptyState label="Offers, counter-offers and trade confirmations all land here — whether you're selling, buying or swapping." />
+              )}
+              <div className="space-y-2.5">
+                {tradeNotifs.map((n) => (
+                  <TradeNotificationCard
+                    key={n.id}
+                    notification={n}
+                    unread={n.createdAt > seenAt}
+                    onNavigate={() => setOpen(false)}
+                  />
+                ))}
+              </div>
+            </TabsContent>
+
             {/* ─── SOCIAL ──────────────────────────────────────────────── */}
             <TabsContent value="social" className="m-0 p-3">
               {activityLoading && activity.length === 0 && (