fix: update news fetching endpoint and adjust NewsItem schema for nullable URL

src/client/Api.ts

@@ -269,7 +269,7 @@ export async function fetchPlayerLeaderboard(
 
 export async function getNews(): Promise<NewsItem[]> {
   try {
-    const res = await fetch(`${getApiBase()}/news`, {
+    const res = await fetch(`${getApiBase()}/news.json`, {
       headers: { Accept: "application/json" },
     });
     if (res.status !== 200) {

src/core/ApiSchemas.ts

@@ -196,7 +196,7 @@ export const NewsItemSchema = z.object({
   id: z.string(),
   title: z.string(),
   description: z.string(),
-  url: z.string().optional(),
+  url: z.string().nullable().optional(),
   type: z.enum(["tournament", "tutorial", "announcement"]),
 });
 export type NewsItem = z.infer<typeof NewsItemSchema>;