Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

packages/admin/src/components/users/index.ts

@@ -0,0 +1,6 @@
+export { RoleBadge } from "./RoleBadge";
+export { getRoleConfig } from "./roleDefinitions.js";
+export { useRolesConfig } from "./useRolesConfig.js";
+export { UserList, UserListSkeleton } from "./UserList";
+export { UserDetail } from "./UserDetail";
+export { InviteUserModal } from "./InviteUserModal";