bug: ionSliding.open('start') ionSliding.open('end') makes the start options unclickable

### 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

v7.x

### Current Behavior

After doing
```
itemSliding.open('end').then(() => itemSliding.open('start')
```
The item options are not clickable on start

### Expected Behavior

Item options should be clickable

### Steps to Reproduce

```
itemSliding.open('end').then(() => itemSliding.open('start')
```
Try to click start options is not possible

### Code Reproduction URL

https://github.com/too/lazy/to/do/this

### Ionic Info

```
Ionic:

Ionic CLI : 7.2.0 (/usr/local/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 8.2.0
@angular-devkit/build-angular : 17.3.7
@angular-devkit/schematics : 17.3.7
@angular/cli : 17.3.7
@ionic/angular-toolkit : 11.0.1

Capacitor:

Capacitor CLI : 6.0.0
@capacitor/android : 6.0.0
@capacitor/core : 6.0.0
@capacitor/ios : not installed

Utility:

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

System:

NodeJS : v20.18.0 (/usr/local/bin/node)
npm : 10.8.3
OS : Linux 6.8
```

### Additional Information

The problem is that the class `item-sliding-closing` doesn't get deleted when opening the start slide:

Workaround:

```
slidingItem.getOpenAmount().then((amount: any) => {
if (amount === 0) {
slidingItem.open('end');
} else if (amount > 0){
slidingItem.open('start').then(() => {
slidingItem.el.classList.remove('item-sliding-closing')
})
} else {
slidingItem.close();
}
});
```

Reproduce the issue with itemSliding.open('end') followed by itemSliding.open('start'), then inspect how the item-sliding-closing class is handled during the transition. Verify the fix by confirming that the start options are clickable after the sequence, without relying on the reported workaround.

由索引模型根据 Issue 内容生成。