[Bug] Does not exit on click of the system title bar X.

[gahisee]

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Fill in what you can; if a section doesn't apply, feel free to remove it.

Your setup

• SONE version: 0.20.0 GPL-3.0
• Install source: .amd64.deb from GitHub
• Distro + version: KDE Neon
• Desktop / session: Wayland, KDE Plasma 6.7
• GPU + driver: Radeon 780M

What went wrong?

Pressing X on the system titlebar does nothing.

What did you expect to happen?

Close or exit the app. Right-click context menu close does work.

How can we reproduce it?

1. in Settings, select System titlebar.
2. press X on the far right corner of titlebar.

Screenshots or recordings

Logs

Log output

Anything else?

One last thing

• I had a quick look through existing issues and didn't see this one already reported.