fix: restore scrollbar styles broken by tailwind v4.3 upgrade

Tailwind v4.3 introduced built-in scrollbar utilities that conflicted
with the tailwind-scrollbar plugin, causing visual regressions.

Fixed by inlining the pre-v4.3 build output directly into main.css,
which also eliminates the need for the tailwind-scrollbar plugin.

package.json

@@ -49,7 +49,6 @@
     "prettier-plugin-go-template": "^0.0.15",
     "puppeteer": "^24.42.0",
     "rimraf": "^6.1.3",
-    "tailwind-scrollbar": "^4.0.2",
     "tailwindcss": "^4.3.0",
     "tw-elements": "2.0.0",
     "typeit": "^8.8.7",