security improvements

frontend/package-lock.json

@@ -7,6 +7,7 @@
       "name": "tono-frontend",
       "dependencies": {
         "@xyflow/react": "^12.0.0",
+        "dompurify": "^3.3.3",
         "html-to-image": "^1.11.13",
         "marked": "^17.0.5",
         "react": "^18.3.0",
@@ -15,6 +16,7 @@
       },
       "devDependencies": {
         "@eslint/js": "^9.39.4",
+        "@types/dompurify": "^3.0.5",
         "@types/react": "^19.2.14",
         "@types/react-dom": "^19.2.3",
         "@types/three": "^0.183.1",
@@ -28,7 +30,7 @@
         "vite": "^8.0.3"
       },
       "engines": {
-        "node": ">=18.0.0",
+        "node": ">=24.0.0",
         "npm": ">=9.0.0"
       }
     },
@@ -787,6 +789,16 @@
         "@types/d3-selection": "*"
       }
     },
+    "node_modules/@types/dompurify": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@types/dompurify/-/dompurify-3.0.5.tgz",
+      "integrity": "sha512-1Wg0g3BtQF7sSb27fJQAKck1HECM6zV1EB66j8JH9i3LCjYabJa0FSdiSgsD5K/RbrsR0SiraKacLB+T8ZVYAg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/trusted-types": "*"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -851,6 +863,13 @@
         "meshoptimizer": "~1.0.1"
       }
     },
+    "node_modules/@types/trusted-types": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
+      "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
+      "devOptional": true,
+      "license": "MIT"
+    },
     "node_modules/@types/webxr": {
       "version": "0.5.24",
       "resolved": "https://registry.npmjs.org/@types/webxr/-/webxr-0.5.24.tgz",
@@ -1965,6 +1984,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/dompurify": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.3.3.tgz",
+      "integrity": "sha512-Oj6pzI2+RqBfFG+qOaOLbFXLQ90ARpcGG6UePL82bJLtdsa6CYJD7nmiU8MW9nQNOtCHV3lZ/Bzq1X0QYbBZCA==",
+      "license": "(MPL-2.0 OR Apache-2.0)",
+      "optionalDependencies": {
+        "@types/trusted-types": "^2.0.7"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",