bug(FabButton): `matFab` shows hover and focus styling with `disabledInteractive`

### 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

The `matFab` button behaves differently from `matButton` with the `disabledInteractive` property. When hovering or clicking the FAB button, it will animate the box shadow such that it looks interactive even if its not.

https://github.com/user-attachments/assets/e71708ff-e0f7-4ce1-944b-fcfa41a9645b

https://github.com/user-attachments/assets/b268dea9-627b-435f-8898-e427b0b379e7

### Reproduction

StackBlitz link: https://stackblitz.com/edit/rfnrrfrf?file=src%2Fexample%2Fbutton-disabled-interactive-example.css
Steps to reproduce:
1. Create a `matFab` with `disabled` + `disabledInteractive`
2. Hover the button
3. Click the button

### Expected Behavior

1. No hover box-shadow changes
2. No mousedown changes

### Actual Behavior

1. Hover will "raise" the button (increase box-shadow)
2. Clicking the button animates it

### Environment

- Angular: 20.2.9
- CDK/Material: 20.2.2
- Browser(s): Chrome/Edge (probably all)
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

从链接的 StackBlitz 复现开始，尤其关注 src/example/button-disabled-interactive-example.css，并比较设置 disabledInteractive 时的 matFab 和 matButton。确认 hover 和 mousedown 不再改变已禁用 FAB 的盒阴影，然后在复现中验证这两种行为。

由索引模型根据 Issue 内容生成。