fix(frontend): guard the outbounds WebSocket handler against non-array payloads

onOutbounds wrote the raw WebSocket payload straight into the
outboundsTraffic cache, unlike the sibling onNodes/onInbounds handlers which
first check Array.isArray. A malformed non-array push (for example an object)
would land in the cache with staleTime Infinity; consumers that call
.find()/.map() on the outbounds list would then throw and crash the Outbounds
tab. Add the same Array.isArray guard so a bad push is ignored.

frontend/src/api/websocketBridge.ts

@@ -31,6 +31,7 @@ export function useWebSocketBridge() {
     };
 
     const onOutbounds: Handler = (payload) => {
+      if (!Array.isArray(payload)) return;
       queryClient.setQueryData(keys.xray.outboundsTraffic(), payload);
     };