fix(api): normalize empty list responses

lib/api/players.ts

@@ -4,7 +4,7 @@ import type { Player } from "@/lib/types"
 import { httpJson } from "./http"
 
 type Paginated<T> = {
-  items: T[]
+  items: T[] | null
   meta: {
     total: number
     offset: number
@@ -16,7 +16,7 @@ export async function listPlayers(): Promise<Player[]> {
   const res = await httpJson<Paginated<Player>>("/api/v1/players?offset=0&limit=100", {
     cache: "no-store",
   })
-  return res.items
+  return res.items ?? []
 }
 
 export async function getPlayerById(playerId: string): Promise<Player | undefined> {