Add scroll to caller/callee menu

Author: pablogsal

Lib/profiling/sampling/heatmap.css

@@ -617,6 +617,8 @@ footer {
   z-index: 1000;
   min-width: 250px;
   max-width: 400px;
+  max-height: 300px;
+  overflow-y: auto;
 }
 
 .callee-menu-header {
@@ -654,6 +656,26 @@ footer {
   color: var(--color-text-muted);
 }
 
+/* Callee menu scrollbar styling */
+.callee-menu::-webkit-scrollbar {
+  width: 8px;
+}
+
+.callee-menu::-webkit-scrollbar-track {
+  background: var(--color-bg-secondary);
+  border-radius: var(--radius-sm);
+}
+
+.callee-menu::-webkit-scrollbar-thumb {
+  background: var(--code-border);
+  border-radius: var(--radius-sm);
+  transition: background var(--transition-base);
+}
+
+.callee-menu::-webkit-scrollbar-thumb:hover {
+  background: var(--color-text-muted);
+}
+
 /* ========================================
    SCROLL MINIMAP MARKER
    ======================================== */