audit fix + beter markdown rendering, more robust with image support

frontend/package.json

@@ -16,6 +16,7 @@
         "react-markdown": "^10.1.0",
         "rehype-raw": "^7.0.0",
         "rehype-sanitize": "^6.0.0",
+        "remark-gfm": "^4.0.1",
         "tailwindcss": "^4.2.2"
     },
     "devDependencies": {
@@ -36,5 +37,8 @@
         "typescript-language-server": "^5.3.0",
         "vite": "^8.0.4",
         "vscode-langservers-extracted": "^4.10.0"
+    },
+    "allowScripts": {
+        "core-js@3.49.0": true
     }
 }