fix(GRO-730): restore global scrollbar polish, scope WebKit hide to .scrollbar-hide utility

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/src/index.css

@@ -67,10 +67,20 @@ input:focus, select:focus, textarea:focus {
 
 /* ─── Scrollbar polish ─── */
 ::-webkit-scrollbar {
-  display: none;
+  width: 6px;
 }
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
 ::-webkit-scrollbar-thumb {
-  display: none;
+  background: #cbd5e1;
+  border-radius: 3px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: #94a3b8;
 }
 
 /* ─── Scrollbar hide utility ─── */
@@ -78,3 +88,7 @@ input:focus, select:focus, textarea:focus {
   -ms-overflow-style: none;
   scrollbar-width: none;
 }
+
+.scrollbar-hide::-webkit-scrollbar {
+  display: none;
+}