Account change details (#5190)

## Summary
Accounts setting page to change a users password or username
Fix huge bug were users can see admin settings due to hard code
admin=true
## Testing
- not run (not requested)

------
[Codex
Task](https://chatgpt.com/codex/tasks/task_b_6934b8ecdbf08328a0951b46db77dfd2)

frontend/src/core/components/shared/AppConfigModal.tsx

@@ -69,7 +69,7 @@ const AppConfigModalInner: React.FC<AppConfigModalProps> = ({ opened, onClose })
   }), []);
 
   // Get isAdmin and runningEE from app config
-  const isAdmin = true // config?.isAdmin ?? false;
+  const isAdmin = config?.isAdmin ?? false;
   const runningEE = config?.runningEE ?? false;
   const loginEnabled = config?.enableLogin ?? false;
 

frontend/src/core/components/shared/config/types.ts

@@ -3,6 +3,7 @@ export const VALID_NAV_KEYS = [
   'preferences',
   'notifications',
   'connections',
+  'account',
   'general',
   'people',
   'teams',

frontend/src/core/services/accountService.ts

@@ -56,4 +56,14 @@ export const accountService = {
     formData.append('newPassword', newPassword);
     await apiClient.post('/api/v1/user/change-password-on-login', formData);
   },
+
+  /**
+   * Change username
+   */
+  async changeUsername(newUsername: string, currentPassword: string): Promise<void> {
+    const formData = new FormData();
+    formData.append('currentPasswordChangeUsername', currentPassword);
+    formData.append('newUsername', newUsername);
+    await apiClient.post('/api/v1/user/change-username', formData);
+  },
 };