fix: add userId to optimistic player in useCreatePlayer

Add temporary userId property to optimistic player object
to satisfy Player type requirements.

The Player type requires userId, but createPlayer only
accepts name/emoji/color. The optimistic update now includes
a temporary userId that gets replaced by the server response.

Fixes 1 TS2741 error in useUserPlayers.ts:108.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/web/src/hooks/useUserPlayers.ts

@@ -110,6 +110,7 @@ export function useCreatePlayer() {
           ...newPlayer,
           createdAt: new Date(),
           isActive: newPlayer.isActive ?? false,
+          userId: 'temp-user', // Temporary userId, will be replaced by server response
         }
         queryClient.setQueryData<Player[]>(playerKeys.list(), [
           ...previousPlayers,