chore: upgrade TypeScript 4.9 to 5.9, ESLint 8.29 to 8.57, @typescript-eslint 5 to 7

Resolves all TS2345/TS2347/TS7006 type errors introduced by stricter TypeScript 5.x.
Fix Icons.Settings to Icons.Setting, cast account data returns, fix implicit any.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/image-pack-view/UserImagePack.tsx

@@ -13,7 +13,10 @@ export function UserImagePack() {
 
   const handleUpdate = useCallback(
     async (packContent: PackContent) => {
-      await mx.setAccountData(AccountDataEvent.PoniesUserEmotes, packContent);
+      await mx.setAccountData(
+        AccountDataEvent.PoniesUserEmotes as unknown as keyof import('matrix-js-sdk').AccountDataEvents,
+        packContent,
+      );
     },
     [mx],
   );