bug(Button toggle): Voice Over not read status pressed / not pressed after select and deselect

### Is this a regression?

- No.

### Description

Voice Over does not read the state of the button as pressed when selected or not pressed when deselected. It only reads 'selected' if you change focus and return to the selected button. The NVDA screen reader does not have this problem, it reads the states correctly.

### Reproduction

Steps to reproduce:
1. Go to official multiple selection example: https://material.angular.io/components/button-toggle/examples#button-toggle-mode
2. Focus those buttons with VO open
3. States presses/ not pressed not announced when toggle buttons

### Expected Behavior

VO should read pressed/ not pressed when button toggled like NVDA do this.

### Actual Behavior

Voice Over does not read the state of the button as pressed when selected or not pressed when deselected.

### Environment

- Angular: 19.2.7
- CDK/Material: 19.2.10
- Browser(s): Chrome, Edge, FF, Safari
- Operating System (e.g. Windows, macOS, Ubuntu): MacOS 15.4.1

Commencez par l’exemple officiel de button-toggle à sélection multiple à l’adresse https://material.angular.io/components/button-toggle/examples#button-toggle-mode et reproduisez le problème avec VoiceOver, puis comparez le comportement avec NVDA. La modification est terminée lorsque la sélection et la désélection d’un toggle amènent VoiceOver à annoncer les états activé et non activé sans déplacer le focus.

Rédigé par le modèle d'indexation à partir du texte de l'issue.