Sort chat messages in descending order by timestamp for improved recency-based display.

frontend/src/app/pages/altitude/chat/service/chat.service.ts

@@ -20,7 +20,7 @@ export class ChatService implements OnDestroy {
   private eventSource?: EventSourcePolyfill;
   private readonly authService: AuthService = inject(AuthService)
   private readonly _messages = signal<ChatMessage[]>([])
-  public readonly messages = computed(() => this._messages().filter((message) => message.server === this._selectedServer()).sort((a, b) => a.timestamp - b.timestamp));
+  public readonly messages = computed(() => this._messages().filter((message) => message.server === this._selectedServer()).sort((a, b) => b.timestamp - a.timestamp));
   private readonly _servers = signal<ChatServer[]>([])
   public readonly servers = computed(() => this._servers().sort((a, b) => a.server.localeCompare(b.server)));
   private readonly _selectedServer = signal<string>('');