Enhance Tailwind CSS configuration and clean up CSS imports

- Extended Tailwind CSS configuration to include new color schemes, border radius settings, and font family for improved theming.
- Removed unnecessary CSS import for shadcn/tailwind.css to streamline styles.

Made-with: Cursor

frontend/src/index.css

@@ -1,5 +1,4 @@
 @import "tw-animate-css";
-@import "shadcn/tailwind.css";
 @import "@fontsource-variable/geist";
 @tailwind base;
 @tailwind components;