feat: support Markdown rendering in product details

apps/spa/package.json

@@ -12,8 +12,10 @@
   "dependencies": {
     "@homaroma/types": "workspace:*",
     "@line/liff": "^2.28.0",
+    "dompurify": "^3.4.10",
     "i18next": "^26.0.4",
     "lucide-react": "^1.17.0",
+    "marked": "^18.0.5",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-i18next": "^17.0.2",
@@ -24,6 +26,7 @@
   "devDependencies": {
     "@eslint/js": "^9.39.4",
     "@tailwindcss/postcss": "^4.2.2",
+    "@types/dompurify": "^3.2.0",
     "@types/node": "^24.12.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",