[Bug]: Scroll-jumping behavior in picker menus on hover

### Code of conduct

- [x] I agree to follow this project's code of conduct.

### Impacted component(s)

sp-picker, sp-menu

### Expected behavior

When hovering over an that contains overflow content, the scroll position should not shift on pointer enter.

### Actual behavior

When activating the and hovering over the subsequent that contains generative model selections in Firefly Boards, users are experiencing a brief scroll-jumping behavior that can be disorienting.

### Screenshots

https://github.com/user-attachments/assets/a8f7524f-b0d4-4883-b7a8-e5df0f510007

https://github.com/user-attachments/assets/7ba3ec82-08c7-45e0-921f-cc2cc11373ea

### What browsers are you seeing the problem in?

Chrome

### How can we reproduce this issue?

The issue can be reproduced in this Storybook story (see attached video): https://opensource.adobe.com/spectrum-web-components/storybook/index.html?path=/story/picker--custom

Anecdotally, this seems to happen more often when a menu item that would otherwise be hidden by overflow is selected.

Screen recording the same behavior in our app (Firefly Boards)

### Sample code or abstract reproduction which illustrates the problem

_No response_

### Severity

SEV 4

### Logs taken while reproducing problem

_No response_

### Would you like to track this issue in Jira?

- [x] Yes, please tell me the ticket number!

Start with the sp-picker and sp-menu components and reproduce the behavior in the linked Storybook picker--custom story using Chrome. Compare the scroll position when entering a menu containing overflow content, especially when an otherwise-hidden item is selected. Done means pointer entry no longer causes the menu to jump while preserving the existing picker behavior.

Written by the indexing model from the issue text.