bug: The ion-no-padding class is not overriding the ion-list padding

### Prerequisites

- [x] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#creating-an-issue).
- [x] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [x] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already report this problem, without success.

### Ionic Framework Version

v8.x

### Current Behavior

The ion-no-padding class is not overriding the ion-list padding


### Expected Behavior

When setting the class ion-no-padding it should not have padding.

### Steps to Reproduce

See the CSS in the example: https://stackblitz.com/edit/wdmx2ux4?file=src%2Fapp%2Fexample.component.html

### Code Reproduction URL

https://stackblitz.com/edit/wdmx2ux4?file=src%2Fapp%2Fexample.component.html

### Ionic Info

```
Ionic:

Ionic CLI : 7.2.1
Ionic Framework : @ionic/angular 8.6.2
@angular-devkit/build-angular : not installed
@angular-devkit/schematics : 19.2.14
@angular/cli : 20.0.4
@ionic/angular-toolkit : 12.2.0

Capacitor:

Capacitor CLI : 7.4.0
@capacitor/android : 7.4.0
@capacitor/core : 7.4.0
@capacitor/ios : not installed

Utility:

cordova-res : not installed globally
native-run : 2.0.1

System:

NodeJS : v22.13.1
npm : 11.4.2
OS : Windows 10
```

### Additional Information

_No response_

Open the linked StackBlitz reproduction and start with src/app/example.component.html, then inspect the computed styles for ion-list and ion-no-padding. Confirm the conflicting padding rule and verify that the reproduction shows no padding when the class is applied.

Written by the indexing model from the issue text.