[web] Default workbench to wider panel (#30156)

GitOrigin-RevId: 65c7f8b89ff9468b07017454e9eca6e11850ac7b

services/web/frontend/js/features/ide-redesign/components/rail/rail-panel.tsx

@@ -37,7 +37,7 @@ export default function RailPanel({
       id={`ide-redesign-sidebar-panel-${isHistoryView ? 'file-tree' : selectedTab}`}
       className={classNames({ hidden: isReviewPanelOpen })}
       order={1}
-      defaultSize={15}
+      defaultSize={selectedTab === 'workbench' ? 20 : 15}
       minSize={5}
       maxSize={80}
       ref={panelRef}