Add chess premoves and time control metadata

- pass chess room time control to the client
- add premove handling and richer chess board UI
- update join result typing for room options

panel/src/lib/useGameRoom.ts

@@ -21,7 +21,7 @@ interface GameRoomState {
     roundResult: RoundResult | null;
     error: string | null;
     sessionReplaced: boolean;
-    roomOptions: { betAmount?: number };
+    roomOptions: { betAmount?: number; timeControl?: string };
 }
 
 export function useGameRoom(roomId: string, userId: string, role?: string, preferAs: "player" | "spectator" = "player") {