feat: add a platform-aware apps download page

Serve desktop and Android builds from the latest Gitea release on /download, and fix the desktop compile and CI flakes that blocked v1.3.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/shared/lib/platform.ts

@@ -0,0 +1,17 @@
+export type AppClient = 'android' | 'windows' | 'linux' | 'macos';
+
+const ORDER: AppClient[] = ['windows', 'macos', 'linux', 'android'];
+
+/** Клиент, который стоит предложить первым по User-Agent. На iOS приложения нет. */
+export function detectAppClient(ua = typeof navigator === 'undefined' ? '' : navigator.userAgent): AppClient | null {
+  if (/Android/i.test(ua)) return 'android';
+  if (/iPhone|iPad|iPod/i.test(ua)) return null;
+  if (/Windows/i.test(ua)) return 'windows';
+  if (/Mac OS X|Macintosh/i.test(ua)) return 'macos';
+  if (/Linux|X11/i.test(ua)) return 'linux';
+  return null;
+}
+
+export function otherAppClients(primary: AppClient | null): AppClient[] {
+  return ORDER.filter((c) => c !== primary);
+}