Feat: 세션 유지 컴포넌트 추가 및 주석 디자인 다크테마 적용

package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@hookform/resolvers": "^5.2.2",
+    "@radix-ui/react-alert-dialog": "^1.1.15",
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@radix-ui/react-label": "^2.1.8",
@@ -26,10 +27,12 @@
     "framer-motion": "^12.31.0",
     "lucide-react": "^0.563.0",
     "next": "16.1.6",
+    "next-themes": "^0.4.6",
     "radix-ui": "^1.4.3",
     "react": "19.2.3",
     "react-dom": "19.2.3",
     "react-hook-form": "^7.71.1",
+    "sonner": "^2.0.7",
     "tailwind-merge": "^3.4.0",
     "tailwindcss-animate": "^1.0.7",
     "tw-animate-css": "^1.4.0",