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/src/lib/role.ts

@@ -7,6 +7,14 @@ export function normalizeRole(rawRole: unknown): string {
     case "superadmin":
     case "super-admin":
       return "super_admin";
+    case "rp_admin":
+    case "rpadmin":
+    case "rp-admin":
+      return "rp_admin";
+    case "tenant_admin":
+    case "tenantadmin":
+    case "tenant-admin":
+      return "tenant_admin";
     default:
       return "user";
   }