fix: stabilize tests and refine RBAC model for privileged roles

- Updated devfront to recognize 'rp_admin' and 'tenant_admin' as privileged developer roles.
- Added specific forbidden messages for privileged roles in devfront.
- Improved adminfront Worksmobile test reliability across browsers.
- Updated Makefile to skip userfront tests in environments without Flutter SDK.
- Applied lint and format fixes across adminfront and devfront.

devfront/tests/clients.spec.ts

@@ -1,8 +1,8 @@
 import { expect, test } from "@playwright/test";
 import {
-  type DevAssignableUser,
   type AuditLog,
   type Consent,
+  type DevAssignableUser,
   installDevApiMock,
   makeClient,
   seedAuth,