feat: integrate Tailwind CSS with custom theme and animations

Added Tailwind CSS and tw-animate-css imports to globals.css. Introduced a custom dark variant and an extensive @theme inline block with CSS variables for colors, radii, and animations. Included keyframes for shimmer-slide, spin-around, gradient, shine, and background-position-spin to enable consistent theming and dynamic UI effects across the application.

middleware.ts

@@ -0,0 +1,8 @@
+import createMiddleware from "next-intl/middleware";
+import { routing } from "./i18n/routing";
+
+export default createMiddleware(routing);
+
+export const config = {
+  matcher: ["/", "/(pt|en)/:path*"],
+};