Error when running the wgpu child window example

**Problem**

Error when running the [wgpu child window](https://github.com/DioxusLabs/dioxus/blob/6cc379718b59184746138d66fcc5f47a6810b3ac/examples/wgpu_child_window.rs) example on Ubuntu 24.04 (Dioxus version 0.7.0-alpha.1):

```
thread 'main' panicked at /home/jeromecaucat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-0.19.4/src/backend/wgpu_core.rs:724:18:
Error in Surface::configure: Validation Error

Caused by:
Requested alpha mode PostMultiplied is not in the list of supported alpha modes: [Opaque, PreMultiplied]
```

I tried with Dioxus version 0.6.3, but then I encounter https://github.com/DioxusLabs/dioxus/issues/3498.

I also tried changing the `alpha_mode` to `Opaque` and `PreMultiplied`, it runs without error but the 3D is rendered on top of the window, hiding its borders and content, which seems to correspond to this comment: https://github.com/DioxusLabs/dioxus/issues/3498#issuecomment-2697790529.

**Steps To Reproduce**

Steps to reproduce the behavior:

- `cargo build --examples --features=desktop,gpu`
- `./target/debug/examples/wgpu_child_window`

**Expected behavior**

Working example.

**Environment:**

- Dioxus version: 0.7.0-alpha.1
- Rust version: 1.88.0
- OS info: Ubuntu 24.04.2 LTS
- App platform: desktop

**Questionnaire**

I'm interested in fixing this myself but don't know where to start.