feat: integrate Tailwind CSS and remove legacy styles

packages/base/Resources/Public/Scss/main.scss

@@ -1,3 +1,8 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* Keep existing imports for now, comment out or remove as needed during conversion */
 @import 'abstracts/variables';
 @import 'abstracts/mixins';
 @import 'abstracts/fonts';