Bug 484038

SUMMARY
Spectacle does not alert users that the new screen recording function is only available on Wayland, not X11. This makes it frustrating for users who cannot use the Wayland backend yet, and try to record video with Spectacle.

Symptoms include:
- recording shortcuts working normally, with the status bar icon appearing
- stopping a recording simply makes the icon disappear, with no notification and no file output
- recording settings appear normally, but the format/extension dropdown doesn't work

STEPS TO REPRODUCE
1. Launch Plasma in an X11 workspace
2. Press Alt+Meta+R to activate recording
3. Notice there are no errors, and the recording appears to work
4. Click the recording button in the status bar to stop recording
5. Check the configured location (`~/Videos/Screencasts`) and notice no new video (as expected on X11)

OBSERVED RESULT
The recording appears to work without error, but no file is produced.

EXPECTED RESULT
An error appears at some point, notifying the user that Spectacle does not support recording on X11.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux latest (6.8.1-zen1-1-zen kernel)
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
I can't use Wayland on my system due to issues with the NVIDIA driver and redrawing window contents - web browser windows on Chromium and Firefox often get "stuck" or flicker black. This is why I'm using X11, despite Wayland being the default as of KDE/Plasma 6.0.