feat: desktop image thumbnails, gallery lightbox portal, client-side compression, clickable table rows, fix header gap

src/app/(dashboard)/sidebar-overlay.tsx

@@ -0,0 +1,14 @@
+"use client";
+
+import { useSidebar } from "@/components/ui/sidebar";
+
+export function SidebarOverlay() {
+  const { open, isMobile, toggleSidebar } = useSidebar();
+  if (isMobile || !open) return null;
+  return (
+    <div
+      className="fixed inset-0 z-[9] bg-black/20"
+      onClick={toggleSidebar}
+    />
+  );
+}