feat: add NewsBox component and integrate news items into PlayPage (#3545)

Resolves #2998 

## Description:

Adds a news box to the lobby homepage that advertises upcoming clan
tournaments, weekly tournaments, and new player tutorials. The component
sits above the username input and cycles through items automatically.

<img width="1138" height="591" alt="screenshot-2026-03-31_00-48-33"
src="https://github.com/user-attachments/assets/4b79287d-6aca-4c81-9bfe-36aad043f381"
/>

<img width="1107" height="595" alt="screenshot-2026-03-31_00-48-24"
src="https://github.com/user-attachments/assets/598e6b8b-e0f2-4864-a5fb-a00c0cc98f37"
/>

<img width="1367" height="599" alt="screenshot-2026-03-31_00-48-04"
src="https://github.com/user-attachments/assets/14f74e70-9dc0-4d67-af6e-c4708e539490"
/>


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

deathllotus

---------

Co-authored-by: Evan <evanpelle@gmail.com>

src/core/ApiSchemas.ts

@@ -191,3 +191,12 @@ export const RankedLeaderboardResponseSchema = z.object({
 export type RankedLeaderboardResponse = z.infer<
   typeof RankedLeaderboardResponseSchema
 >;
+
+export const NewsItemSchema = z.object({
+  id: z.string(),
+  title: z.string(),
+  description: z.string(),
+  url: z.string().nullable().optional(),
+  type: z.enum(["tournament", "tutorial", "announcement"]).or(z.string()),
+});
+export type NewsItem = z.infer<typeof NewsItemSchema>;