Improve HK sidebar and restore nested content scrolling

src/components/smooth-scroll.tsx

@@ -1,9 +1,12 @@
 "use client";
 
 import { Lenis } from "lenis/react";
+import { usePathname } from "next/navigation";
 import { useEffect, useState } from "react";
 
 export function SmoothScroll() {
+	const pathname = usePathname();
+	const isAdmin = pathname === "/admin" || pathname?.startsWith("/admin/");
 	const [prefersReduced, setPrefersReduced] = useState(true);
 
 	useEffect(() => {
@@ -14,7 +17,8 @@ export function SmoothScroll() {
 		return () => mq.removeEventListener("change", onChange);
 	}, []);
 
-	if (prefersReduced) return null;
+	// Admin panels own their scroll containers; root wheel smoothing consumes their events.
+	if (prefersReduced || isAdmin) return null;
 
 	return (
 		<Lenis