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/src-tauri/Cargo.lock

@@ -678,7 +678,7 @@ dependencies = [
 
 [[package]]
 name = "chat-app-desktop"
-version = "0.8.0"
+version = "0.9.0"
 dependencies = [
  "serde",
  "serde_json",