bug: Scroll Behavior on IOS Device

### 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, v8.x

### Current Behavior

### Testing our Application on a real IPhone (Iphone 14 Pro)

When the Keyboard opens in an Form, there are 2 weird behaviors:

1. I can **not** scroll to the last elements
2. I can select the Ion-Header or Ion-Tab-Bar and scroll the whole Page

### Expected Behavior

I would expect that i can not drag the whole page and that the Ion-content is getting reduced to the available space between Header and Keyboard.

### Steps to Reproduce

1. Go To "https://stackblitz.com/edit/ifbpeyfz?file=index.html"
2. Select Tab "Listen Now"
3. Select second text-area
4. scroll on "ion-tab-bar" or "ion-header"

https://github.com/user-attachments/assets/8b784c9b-3405-4024-85b7-686e7c03d18a

### Code Reproduction URL

https://github.com/Allatu/IonicTest

### Ionic Info

Ionic:

Ionic CLI : 7.2.0
Ionic Framework: @ionic/core 8.4.1

Utility:

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

System:

NodeJS : v20.15.0
npm : 10.7.0
OS : Windows 10

### Additional Information

_No response_

首先，在真实 iPhone 上运行 StackBlitz 复现，并检查第二个文本区域打开键盘时 ion-content、ion-header 和 ion-tab-bar 的行为。完成标准是页面无法从 header 或 tab bar 处拖动，并且 ion-content 仍限制在 header 与键盘之间的空间内。

由索引模型根据 Issue 内容生成。