Call interface is slightly blurry

### Steps to reproduce

Start a call with Element Call

### Outcome

#### What did you expect?

Call interface should render crisply.

#### What happened instead?

Call interface is slightly blurry, and the borders on buttons are cut off on one side.

I am pretty sure this is due to the recent changes to how Element Web's left panel can be resized. The iframe ends up with a fractional width which is the cause for all the blurriness.

### Operating system

NixOS 25.11

### Browser information

Firefox 149.0

### URL for webapp

develop.element.io

### Application version

Element version: 738a4a16c584-js-4d592915382d Crypto version: Rust SDK 0.16.0 (1ac734e), Vodozemac 0.9.0

### Homeserver

Not relevant

### Will you send logs?

No