Flashing audio setting

### Steps to reproduce

1. Where are you starting? What can you see?
All settings > Voice & Video > Observe glitch on the top of the window

https://github.com/user-attachments/assets/0ed376cb-c658-497d-9044-194228fd7ef8

### Outcome

#### What did you expect?
For intended settings to persist.
#### What happened instead?
it flashed.

### Operating system

Linux Mint

### Application version

Element Nightly version: 2026082501

### How did you install the app?

element.io/get-started

### Homeserver

matrix.org

### Will you send logs?

No

Reproduce the flashing in All settings > Voice & Video on Linux Mint using the reported Element Nightly version, and identify which setting or top-of-window element is affected. Compare the visible behavior with the expected persisted setting; done means the intended audio setting remains stable instead of flashing.

Written by the indexing model from the issue text.