highlight: smaller bundle size, fix light & dark theme

examples/server/webui/package.json

@@ -6,9 +6,11 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "analyze": "ANALYZE=1 npx vite-bundle-visualizer"
   },
   "devDependencies": {
+    "sass-embedded": "^1.83.0",
     "vite": "^5.4.10"
   },
   "dependencies": {
@@ -16,7 +18,6 @@
     "daisyui": "^4.12.14",
     "highlight.js": "^11.10.0",
     "markdown-it": "^14.1.0",
-    "markdown-it-highlightjs": "^4.2.0",
     "markdown-it-katex-gpt": "^1.1.0",
     "postcss": "^8.4.49",
     "tailwindcss": "^3.4.15",