fix(editor): improve menu content UX on toolbar (#11491)

* Added scrollbar style

![Screenshot 2025-04-07 at 11.50.19.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/8ypiIKZXudF5a0tIgIzf/c2a44dcc-7f24-44d5-a855-e2c1671e85f9.png)

* Used `padding` instead of `offset`

blocksuite/affine/shared/src/utils/button-popper.ts

@@ -42,7 +42,6 @@ export type ButtonPopperOptions = {
   crossAxis?: number;
   allowedPlacements?: Placement[];
   rootBoundary?: Rect | (() => Rect | undefined);
-  ignoreShift?: boolean;
   offsetHeight?: number;
 };
 /**
@@ -68,7 +67,6 @@ export function createButtonPopper(options: ButtonPopperOptions) {
     crossAxis,
     allowedPlacements = ['top', 'bottom'],
     rootBoundary,
-    ignoreShift,
     offsetHeight,
   } = options;
 
@@ -102,11 +100,7 @@ export function createButtonPopper(options: ButtonPopperOptions) {
         }),
       ],
     })
-      .then(({ x, y, middlewareData: data }) => {
-        if (!ignoreShift) {
-          x += data.shift?.x ?? 0;
-          y += data.shift?.y ?? 0;
-        }
+      .then(({ x, y }) => {
         Object.assign(popperElement.style, {
           position: 'absolute',
           zIndex: 1,