Discord (#4367)

Resolves #(issue number)

## Description:

continuation of https://github.com/openfrontio/infra/pull/359
adds ability to put discord URL into a dedicated slot 

pc:
<img width="1917" height="921" alt="image"
src="https://github.com/user-attachments/assets/100a25d5-e998-4744-904e-df40b74ccd76"
/>

mobile:
<img width="385" height="826" alt="image"
src="https://github.com/user-attachments/assets/de904f83-c88f-41e7-9c98-81c2296ec9a2"
/>


## 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

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

w.o.n

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/core/ClanApiSchemas.ts

@@ -36,12 +36,45 @@ export const ClanInfoSchema = z.object({
   name: z.string().max(35),
   tag: RequiredClanTagSchema,
   description: z.string().max(200),
+  // Discord invite URL set by the clan leader; null when unset. Optional
+  // because not every ClanInfo source includes it (e.g. browse results).
+  discordUrl: z.string().max(255).nullable().optional(),
   isOpen: z.boolean(),
   createdAt: z.iso.datetime().optional(),
   memberCount: z.number().optional(),
 });
 export type ClanInfo = z.infer<typeof ClanInfoSchema>;
 
+// Client-assembled view model for the clan Discord card. `valid` is false only
+// on a definitive Discord 404 (invite revoked); other failures degrade to the
+// plain link with valid: true.
+export type ClanDiscord = {
+  url: string;
+  valid: boolean;
+  serverName?: string;
+  iconUrl?: string | null;
+  bannerUrl?: string | null;
+  description?: string | null;
+  onlineCount?: number | null;
+  memberCount?: number | null;
+};
+
+// Subset of Discord's public GET /invites/{code}?with_counts=true response,
+// parsed client-side into ClanDiscord. snake_case mirrors Discord's wire format.
+export const DiscordInviteResponseSchema = z.object({
+  guild: z
+    .object({
+      id: z.string(),
+      name: z.string(),
+      icon: z.string().nullable().optional(),
+      banner: z.string().nullable().optional(),
+      description: z.string().nullable().optional(),
+    })
+    .optional(),
+  approximate_member_count: z.number().optional(),
+  approximate_presence_count: z.number().optional(),
+});
+
 export const ClanBrowseResponseSchema = z.object({
   results: ClanInfoSchema.array(),
   total: z.number(),