Show default chess control detail in room summary

- Use the selected chess time control detail when available
- Fall back to a balanced default description when no match is found

panel/src/games/GameLobby.tsx

@@ -142,7 +142,8 @@ function CreateRoomDialog({
     if (!show) return null;
 
     const selectedGame = configGame ? gameUIRegistry.get(configGame) : null;
-    const selectedChessControl = CHESS_TIME_CONTROLS.find(control => control.key === chessTimeControl) ?? CHESS_TIME_CONTROLS[0];
+    const selectedChessControl = CHESS_TIME_CONTROLS.find(control => control.key === chessTimeControl);
+    const selectedChessControlDetail = selectedChessControl?.detail ?? "Balanced default for most quick matches.";
 
     return (
         <div
@@ -271,7 +272,7 @@ function CreateRoomDialog({
                                     <div className={cn("rounded-3xl border p-4", gameSurfaceClass("chess"))}>
                                         <div className="text-[11px] uppercase tracking-[0.2em] text-text-disabled">Room Summary</div>
                                         <div className="mt-3 text-lg font-semibold text-foreground">{CHESS_TIME_CONTROL_LABELS[chessTimeControl]}</div>
-                                        <div className="mt-1 text-sm text-text-tertiary">{selectedChessControl.detail}</div>
+                                        <div className="mt-1 text-sm text-text-tertiary">{selectedChessControlDetail}</div>
                                         <div className="mt-4 space-y-3 text-sm text-text-secondary">
                                             <div className="flex items-center justify-between gap-3">
                                                 <span>Launch</span>