fix(v2): radar data flow + inventory icons

Radar:
- nearby_objects WebSocket messages now tracked in useLiveData state
- Passed through MapLayout → WindowRenderer → RadarWindow
- Objects list updates live as radar data streams in

Inventory:
- Items now render actual game icons via /icons/{hexId}.png
  using the portal.dat offset formula (iconRaw + 0x06000000)
- Hover tooltip shows: name, material, AL, damage, workmanship,
  tinks, set, imbue (multi-line)
- Equipment grid slots show item icons instead of text names
- Pack item grid shows item icons with proper tooltips
- Fallback icon (06000133.png) on load error

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/map/MapLayout.tsx

@@ -57,7 +57,8 @@ export const MapLayout: React.FC<Props> = ({ data, onViewToggle }) => {
             showHeatmap={showHeatmap}
             showPortals={showPortals}
           />
-          <WindowRenderer characters={data.characters} chatMessages={data.chatMessages} socket={data.socketRef.current} />
+          <WindowRenderer characters={data.characters} chatMessages={data.chatMessages}
+            nearbyObjects={data.nearbyObjects} socket={data.socketRef.current} />
           <RareNotification recentRares={data.recentRares} />
         </div>
       </WindowManagerProvider>