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.

components/theme-provider.tsx

@@ -0,0 +1,10 @@
+"use client";
+
+import { ThemeProvider as NextThemesProvider } from "next-themes";
+import { type ComponentProps } from "react";
+
+type ThemeProviderProps = ComponentProps<typeof NextThemesProvider>;
+
+export function ThemeProvider({ children, ...props }: ThemeProviderProps) {
+  return <NextThemesProvider {...props}>{children}</NextThemesProvider>;
+}