bug(ProgressSpinner): Styling overwrites for size and width have no effect

### 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

When overwriting the Styles for the ProgressSpinner via `@include mat.progress-spinner-overrides((...));`, overwrites of the properties `size` and `active-indicator-width` have no effect.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/mnfmk4bd-kqhgpb12?file=src%2Fexample%2Fprogress-spinner-overview-example.scss
Steps to reproduce:
n/a

### Expected Behavior

Overwriting `size` and `active-indicator-width` in `@include mat.progress-spinner-overrides((...));` change the size and width of the spinner.

### Actual Behavior

`size` and `active-indicator-width` have no effect.

### Environment

- Angular: 20.2.0
- CDK/Material: 20.2.0
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS, Linux

从 src/example/progress-spinner-overview-example.scss 中的 StackBlitz 复现开始，检查 ProgressSpinner 针对 size 和 active-indicator-width 的样式覆盖是如何应用的。在 Angular Material 20.2.0 下，当这两个覆盖都能明显改变 spinner 的大小和指示器宽度时，该 issue 即完成。

由索引模型根据 Issue 内容生成。