bug(popups): Material popups shown from native HTML dialog don't register mouse events.

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

Mouse events not registering on multiple material components inside native Dialog.

Originally they appeared behind the dialog due to being created outside of #top-layer.
https://github.com/angular/components/issues/25799

Now they mostly just don't work. They appear in-front of dialog... but mouse events (click/hover) don't register.
https://stackblitz.com/edit/stackblitz-starters-wmwfsj8g?file=src%2Fmain.ts

### Reproduction

StackBlitz link: https://stackblitz.com/edit/stackblitz-starters-wmwfsj8g?file=src%2Fmain.ts
Steps to reproduce:
1. click button to open a native dialog
2. click any of the material components

### Expected Behavior

The MatMenu and DatePicker should work as expected.

### Actual Behavior

Ignores mouse events.

### Environment

- Angular: 21.1.3
- CDK/Material: 21.1.3
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS

Beginne mit der verknüpften StackBlitz-Reproduktion in src/main.ts und überprüfe das Verhalten in Chrome: Öffne den nativen Dialog und probiere anschließend MatMenu und DatePicker aus. Verfolge, wie diese Material-Popups relativ zur Top-Layer-Ebene des nativen Dialogs positioniert werden, und bestätige, dass Klick- und Hover-Ereignisse die Komponenten erreichen. Erledigt ist es, wenn beide Komponenten auf Mausereignisse reagieren, während der Dialog geöffnet ist.

Vom Indexierungsmodell aus dem Issue-Text verfasst.