Frontend: pridavanie botov v lobby

Hostitel prida na volne sedadlo bota (+ Bot = heuristika, + AI bot =
natrenovana siet) alebo bota odoberie; boti maju vlastnu ikonu a flag
is_bot v rosteroch. Surove ucty bot:<kind>-<n> sa vsade zobrazuju cez
displayName ako "Bot 2" / "AI bot 1" (stol, kopka, tabulky, historia).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/components/Trick.tsx

@@ -1,5 +1,6 @@
 import type { PlayerInfo, StashData } from '../types';
 import CardView from './CardView';
+import { displayName } from '../lib/names';
 
 interface Props {
   stash: StashData | null;
@@ -18,7 +19,7 @@ export default function Trick({ stash, players, myOrder }: Props) {
     : [];
 
   const nameFor = (order: number) =>
-    players.find((p) => p.order === order)?.name ?? '';
+    displayName(players.find((p) => p.order === order)?.name);
 
   const overlap = -16;
   const slotH = 80;