Poles UI/UX premium: fondasi global

- Font Plus Jakarta Sans (Google Fonts) menggantikan font sistem default
- Sidebar: brand area gradient + nama sekolah, nav aktif jadi pill gradient
  biru-indigo + chevron, label grup lebih elegan, footer badge NOCTKJ.net
- Topbar: sticky + backdrop-blur glass
- Background utama: gradient halus slate → biru samar
- Kartu standar premium (.card) + tombol (.btn-primary/.btn-outline) + input
  seragam di CSS; kartu utama halaman diseragamkan rounded-2xl
- Border global diselaraskan ke palet slate; scrollbar & seleksi teks premium
- Verifikasi: 29 test / 99 assertion, blade cache OK, vite build OK

resources/views/settings/backup.blade.php

@@ -70,7 +70,7 @@
     </div>
 
     {{-- Daftar Backup --}}
-    <div class="bg-white rounded-2xl shadow-sm border border-gray-200 overflow-hidden">
+    <div class="bg-white rounded-2xl shadow-sm border border-slate-200 overflow-hidden">
         <div class="px-6 py-4 border-b border-gray-100 flex items-center justify-between">
             <div class="flex items-center gap-3">
                 <div class="w-9 h-9 rounded-xl bg-gradient-to-br from-blue-500 to-blue-600 flex items-center justify-center shadow-sm">