fix: adapt frontend for legacy Chrome and runtime config

frontend-web/package.json

@@ -10,7 +10,9 @@
     "build:test": "node --max-old-space-size=8192 ./node_modules/vite/bin/vite.js build --mode test",
     "build:network": "node --max-old-space-size=8192 ./node_modules/vite/bin/vite.js build --mode network",
     "preview": "vite preview",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "check:chrome109-css": "node scripts/check-chrome109-css.mjs",
+    "check:legacy-chrome-css": "node scripts/check-chrome109-css.mjs"
   },
   "dependencies": {
     "@codemirror/lang-css": "^6.3.1",
@@ -110,6 +112,7 @@
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^5.0.4",
+    "lightningcss": "^1.30.2",
     "postcss": "^8.5.3",
     "tailwindcss": "^4.0.15",
     "tw-animate-css": "^1.4.0",