chore: clean up and restructure repository

src/pages/admin/Settings.jsx

@@ -1,5 +1,5 @@
 import React, { useMemo } from 'react';
-import { useNavigate, Link } from 'react-router-dom';
+import { Link } from 'react-router-dom';
 import {
   Activity, Bell, Building2, KeyRound, Shield, User as UserIcon, Users,
   ChevronRight, Sliders,
@@ -10,14 +10,13 @@ import { useAssistantPanel } from '@/components/ai-assistant';
 import {
   useJobPostings, usePreferences, useStaff, useUpdatePreferences,
 } from '@/lib/krowHooks';
-import { AdminPage } from '@/pages/admin/_shell';
+import { AdminPage } from '@/components/admin/PageShell';
 
 /**
  * Admin Settings — Full-width platform configuration control center.
  */
 
 export default function AdminSettings() {
-  const navigate = useNavigate();
   const preferences = usePreferences();
   const updatePreferences = useUpdatePreferences();
   const panel = useAssistantPanel();