refactor: update class names for consistency and improve styling

- Changed `flex-shrink-0` to `shrink-0` in multiple components for better consistency.
- Updated button and checkbox classes to use `rounded-sm` for a more uniform appearance.
- Adjusted backdrop blur classes for modals to `backdrop-blur-xs` for a subtler effect.
- Removed unused Tailwind CSS configuration file.

src/components/Layout.jsx

@@ -52,7 +52,7 @@ export default function Layout() {
         {/* Email verification banner */}
         {user && user.email_verified === 0 && (
           <div className="bg-amber-500/15 border-b border-amber-500/30 px-4 py-2.5 flex items-center justify-center gap-3 text-sm">
-            <AlertTriangle size={15} className="text-amber-400 flex-shrink-0" />
+            <AlertTriangle size={15} className="text-amber-400 shrink-0" />
             <span className="text-amber-200">{t('auth.emailVerificationBanner')}</span>
             <button
               onClick={handleResendVerification}