feat(backoffice): redesign backoffice UI dengan shadcn/ui

Menyeluruh merancang ulang apps/backoffice memakai pola shadcn/ui sambil
mempertahankan seluruh palette warna existing (primary/neutral/success/
info/warning/danger) dan typography Bai Jamjuree.

UI library (libs/ui):
- Atoms existing (Button, Input, Label, Textarea, Card, Dialog, Drawer,
  Form, Select, Toggle) dirombak ke pola shadcn, API dipertahankan agar
  sibling apps (gacha, dimentorin, hackathon, qrcampaign) tidak break
- Select atom beralih dari native ke Radix Select + NativeSelect fallback
- 18 atom baru: Badge, Avatar, Separator, Skeleton, Tabs, Tooltip,
  DropdownMenu, Popover, AlertDialog, Checkbox, RadioGroup, Switch,
  ScrollArea, Sheet, Sidebar, Breadcrumb, Table, + use-mobile hook
- DataTable, Filter, BackofficeWrapper, Pagination, Modal (alias Dialog)
  direstyle dengan token baru
- CSS variable layer shadcn ditambahkan (--color-primary, --color-sidebar-*,
  dll) dipetakan ke palette existing; tw-animate-css di-import untuk
  transisi

Backoffice shell:
- Sidebar bersarang SidebarProvider + SidebarInset, built-in mobile Sheet,
  user DropdownMenu (Avatar + logout), ikon lucide-react

Pages redesign (19 list/dashboard/settings):
- accounts, cms-events, cms-testimonials, dashboard, dashboard-dimentorin
  (dengan recharts di Card), feedback-review-dimentorin, gacha-roll,
  hackathon-dashboard, hackathon-submissions, hackathon-teams,
  hackathon-users, permissions, prizes, roadmap-dimentorin, roles,
  session-dimentorin, settings-dimentorin (Tabs), transactions,
  users-dimentorin (Tabs mentor/mentee)
- Pola unified: BackofficeWrapper > Card (CardHeader toolbar + CardContent
  DataTable) + AlertDialog untuk delete confirm
- Form accounts_/$id diredesign; form pages lain tetap pakai
  ControlledInputField yang sekarang berbasis shadcn Input

Dependencies:
- +20 radix-ui primitives, lucide-react, cmdk, input-otp
- Select native patched di dimentorin (profile-sidebar, schedule step)
  untuk tetap kompatibel via NativeSelect alias

Verifikasi:
- nx build backoffice: sukses (2.33s, 4801 modules)
- nx build dimentorin/gacha/hackathon/qrcampaign: semua sukses (zero
  regresi dari rewrite libs/ui)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -41,8 +41,27 @@
     "@hookform/resolvers": "^5.2.2",
     "@iconify/react": "^6.0.2",
     "@marsidev/react-turnstile": "^1.5.0",
+    "@radix-ui/react-accordion": "^1.2.4",
+    "@radix-ui/react-alert-dialog": "^1.1.7",
+    "@radix-ui/react-avatar": "^1.1.4",
+    "@radix-ui/react-checkbox": "^1.1.5",
+    "@radix-ui/react-collapsible": "^1.1.4",
+    "@radix-ui/react-dialog": "^1.1.7",
+    "@radix-ui/react-dropdown-menu": "^2.1.7",
+    "@radix-ui/react-hover-card": "^1.1.7",
     "@radix-ui/react-label": "^2.1.8",
+    "@radix-ui/react-popover": "^1.1.7",
+    "@radix-ui/react-progress": "^1.1.3",
+    "@radix-ui/react-radio-group": "^1.2.4",
+    "@radix-ui/react-scroll-area": "^1.2.4",
+    "@radix-ui/react-select": "^2.1.7",
+    "@radix-ui/react-separator": "^1.1.3",
     "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-switch": "^1.1.4",
+    "@radix-ui/react-tabs": "^1.1.4",
+    "@radix-ui/react-toggle": "^1.1.3",
+    "@radix-ui/react-toggle-group": "^1.1.3",
+    "@radix-ui/react-tooltip": "^1.1.7",
     "@redocly/ajv": "^8.18.1",
     "@tailwindcss/vite": "^4.2.2",
     "@tanstack/react-query": "^5.95.2",
@@ -54,11 +73,14 @@
     "axios": "^1.14.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "cmdk": "^1.1.1",
     "dayjs": "^1.11.20",
     "framer-motion": "^12.38.0",
     "graphql": "^16.13.2",
     "html2canvas": "^1.4.1",
+    "input-otp": "^1.4.2",
     "js-cookie": "^3.0.5",
+    "lucide-react": "^0.469.0",
     "openapi-fetch": "^0.17.0",
     "openapi-react-query": "^0.5.4",
     "picomatch": "^4.0.4",