chore: bump version to 0.9.0

File variety (video/pdf/generic), user status with custom message,
auto online/offline, DND gate for ring + notifications, drag-drop +
paste upload, @mentions in groups, link previews, emoji picker,
crash recovery.

apps/desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@chat-app/desktop",
-  "version": "0.8.0",
+  "version": "0.9.0",
   "private": true,
   "description": "Tauri v2 desktop client (Windows / macOS / Linux)",
   "type": "module",