fix(core): sidebar scrollbar is coverd by resize handle (#8307)

close AF-1236

packages/frontend/component/src/components/resize-panel/resize-panel.css.ts

@@ -50,7 +50,7 @@ export const resizeHandleContainer = style({
   right: resizeHandleOffsetVar,
   top: resizeHandleVerticalPadding,
   bottom: resizeHandleVerticalPadding,
-  width: 16,
+  width: 8,
   zIndex: '1',
   transform: 'translateX(50%)',
   backgroundColor: 'transparent',