Polish Studio visuals

- Card-shaped loading skeletons with shimmer text lines
- Hover lift and accent shadow on furni cards
- Subtle dotted floor pattern behind previews and detail image
- Sticky action footer in the detail drawer
- Theme-aware slim scrollbars inside the admin panel
- Nicer empty state with icon tile

src/app/globals.css

@@ -211,6 +211,26 @@ summary,
 	background: transparent;
 }
 
+/* Theme-aware scrollbars inside the admin panel */
+[data-admin] ::-webkit-scrollbar {
+	width: 10px;
+	height: 10px;
+}
+[data-admin] ::-webkit-scrollbar-thumb {
+	background-color: color-mix(
+		in srgb,
+		var(--admin-text-muted) 32%,
+		transparent
+	);
+}
+[data-admin] ::-webkit-scrollbar-thumb:hover {
+	background-color: color-mix(
+		in srgb,
+		var(--admin-text-muted) 55%,
+		transparent
+	);
+}
+
 /* ── Atom theme components ────────────────────────────────── */
 @layer components {
 	.nav-item {