Decorations: keep them through IMVU's own room updates

After the owner saves, IMVU's server sends everyone the saved room ({"command": "SetRoomState"} from
admin on the chat's control mount), which has no decorations: the proxy now adds them to it, and takes
community products out of any outgoing one. A change notice from the hub also no longer empties the
remembered decorations while the new ones are asked for (a broadcast arriving meanwhile went through
without them).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/products/intercept.go

@@ -578,6 +578,12 @@ func (p *Products) Outgoing(queue, mount string, message []byte) ([]byte, bool)
 }
 
 func (p *Products) outgoing(queue, mount string, message []byte) ([]byte, bool) {
+	if strings.HasPrefix(queue, "/chat/") && mount == "control" {
+		if out, changed := p.outgoingControlScene(message); changed {
+			return out, false
+		}
+		return message, false
+	}
 	if !strings.HasPrefix(queue, "/chat/") || mount != "messages" {
 		return message, false
 	}