UI/Qt: “Exit fullscreen” popup that appears when you switch Ladybird to full screen and won't go away

Summary

When you switch Ladybird to full screen, an “exit full screen” pop-up appears and won't go away. The text seems to indicate that it's a button and that clicking it should exit full screen, but nothing happens.

Operating system

macOS

Steps to reproduce

1. Open ladybug
2. Set Ladybird to full screen

Expected behavior

The pop-up should disappear after a few seconds, and clicking on it should bring Ladybird out of full-screen mode.

Actual behavior

The pop-up appears and never goes away, and clicking on it does nothing.

URL for a reduced test case

N/A

HTML/SVG/etc. source for a reduced test case

N/A

Log output and (if possible) backtrace

N/A

Screenshots or screen recordings

When I hover my mouse over the button for a few seconds, that's when I'm trying to click on it. As you can see, nothing happens.

https://github.com/user-attachments/assets/a84f8459-f0f8-4036-9efa-1eb1c9ea68db

Build flags or config settings

No response