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.

tailwind.config.js

@@ -174,6 +174,5 @@ module.exports = {
   plugins: [
     require("@tailwindcss/typography"),
     require("@tailwindcss/forms"),
-    require("tailwind-scrollbar")({ preferredStrategy: "pseudoelements" }),
   ],
 };