bug: Ion footer has no padding if app has ion tab bar hidden

### 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

```
render() {
const { translucent, collapse } = this;
const mode = getIonMode(this);
const tabs = this.el.closest('ion-tabs');
const tabBar = tabs?.querySelector(':scope > ion-tab-bar');

return (

{mode === 'ios' && translucent &&

}


);
}
```

ion-footer doesn't have the "footer-toolbar-padding" if app contains a tab-bar

### Expected Behavior

As there are some workaround online to hide the tab bar when navigating to child routes I think there should be a check of whether the tab-bar is displayed (by checking if display none is applied).
That way there is no harm to a case where the tab bar is always shown but benefit when a user wants to manually hide it in some pages
Btw there could be serval ways to hide or show the tab bar but that's not the main thing I wanted to show

### Steps to Reproduce

https://stackblitz.com/edit/sb1-wnpdveiy?file=src%2Fpages%2FTabsPage.tsx

You won't be able to see the problem not on real device unless you inspect the classes in DOM

### Code Reproduction URL

https://stackblitz.com/edit/sb1-wnpdveiy?file=src%2Fpages%2FTabsPage.tsx

### Ionic Info

"@ionic/react": "^8.4.3",
"@ionic/react-router": "^8.4.3",
"ionicons": "^7.2.2",
"lucide-react": "^0.344.0",
"react": "^18.3.1",
"react-dom": "^18.3.1",
"react-router": "^5.3.4",
"react-router-dom": "^5.3.4"

### Additional Information

_No response_

Start with the ion-footer render logic shown in the issue and reproduce the behavior using the linked StackBlitz TabsPage.tsx example. Verify the footer's padding class when the tab bar is hidden, and confirm the fix against the tab-bar-visible and tab-bar-hidden cases.

索引モデルが issue の本文から書いたものです。