feat: code sandbox

[deploy]

package.json

@@ -25,6 +25,12 @@
     "@vite-pwa/sveltekit": "^0.2.5",
     "@fontsource-variable/noto-sans-mono": "^5.0.4",
     "@fontsource-variable/material-symbols-rounded": "^5.0.4",
+    "@codemirror/state": "^6.2.1",
+    "@codemirror/commands": "^6.2.4",
+    "@codemirror/autocomplete": "^6.9.0",
+    "@codemirror/lang-javascript": "^6.1.9",
+    "@codemirror/language": "^6.8.0",
+    "codemirror": "^6.0.1",
     "stylelint": "^15.9.0",
     "stylelint-config-standard-scss": "^10.0.0",
     "stylelint-config-prettier-scss": "^1.0.0",