Import source: cshare-app/src/hooks/useLenis

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

cshare-app/src/hooks/useLenis.js

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+import { useEffect } from 'react';
+import { useLocation } from 'react-router-dom';
+import Lenis from 'lenis';
+
+let lenis = null;
+
+export function useLenis() {
+  const { pathname } = useLocation();
+
+  useEffect(() => {
+    lenis = new Lenis({
+      duration: 1.2,
+      easing: (t) => Math.min(1, 1.001 - Math.pow(2, -10 * t)),
+      smoothWheel: true,
+      wheelMultiplier: 1,
+      touchMultiplier: 1.5,
+    });
+
+    function raf(time) {
+      lenis.raf(time);
+      requestAnimationFrame(raf);
+    }
+
+    const rafId = requestAnimationFrame(raf);
+
+    return () => {
+      cancelAnimationFrame(rafId);
+      lenis.destroy();
+      lenis = null;
+    };
+  }, []);
+
+  // Scroll to top on route change
+  useEffect(() => {
+    if (lenis) lenis.scrollTo(0, { immediate: true });
+  }, [pathname]);
+}