Tooltip Not Dismissing on Hover Out

### Steps to reproduce

Scrolling in the "Seen by" list causes tooltips to go outside of the popover.

https://github.com/user-attachments/assets/a4e37044-7a8f-4995-a25f-d1ef83bd18c7

### Outcome

#### What did you expect?
Tooltips disappear when not hovered on and remain within the popover.
#### What happened instead?
Persisted outside hover and went beyond popover.

### Operating system

Linux Mint

### Application version

Element Nightly version: 2026040101

### How did you install the app?

element.io/get-started

### Homeserver

matrix.org

### Will you send logs?

Yes

Start by reproducing the issue in the “Seen by” list while scrolling, then trace the tooltip behavior associated with the popover and hover-out interaction. Done means tooltips dismiss when the pointer leaves and remain within the popover during scrolling; verify the behavior in the reported Element Nightly scenario.

Written by the indexing model from the issue text.