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/features/overview/GlobalOverviewPage.tsx

@@ -4,8 +4,8 @@ import {
   Activity,
   AlertTriangle,
   CheckCircle2,
-  Clock3,
   ChevronDown,
+  Clock3,
   Layers3,
   LayoutDashboard,
   ShieldCheck,
@@ -21,7 +21,6 @@ import {
 import { DeveloperAccessRequestCard } from "../../components/common/DeveloperAccessRequestCard";
 import { Badge } from "../../components/ui/badge";
 import { Button } from "../../components/ui/button";
-import { useDeveloperAccessGate } from "../developer-access/developerAccessGate";
 import {
   type ClientSummary,
   fetchClients,
@@ -35,6 +34,7 @@ import {
 import { t } from "../../lib/i18n";
 import { resolveProfileRole } from "../../lib/role";
 import { fetchMe } from "../auth/authApi";
+import { useDeveloperAccessGate } from "../developer-access/developerAccessGate";
 import {
   buildRecentClientChanges,
   type RecentClientChange,