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.

app/error.tsx

@@ -0,0 +1,28 @@
+"use client";
+
+import { useEffect } from "react";
+import { Button } from "@/components/ui/button";
+
+export default function Error({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    console.error(error);
+  }, [error]);
+
+  return (
+    <div className="min-h-screen flex items-center justify-center">
+      <div className="text-center space-y-4">
+        <h2 className="text-2xl font-bold">Algo deu errado!</h2>
+        <p className="text-muted-foreground">
+          Ocorreu um erro inesperado. Tente novamente.
+        </p>
+        <Button onClick={reset}>Tentar novamente</Button>
+      </div>
+    </div>
+  );
+}