wallpapers/slideshow: Allow setting global shortcut for next image action

  • wallpapers/slideshow: Allow setting global shortcut for next image action

Moves the action to the backend plugin so it can talk to KGlobalAccel. Can be handy to have a shortcut rather than having to use the menu every time.

Reason for the change

see commit

Test plan

Assigned a global shortcut through the KCM, pressed it, wallpaper changed. No shortcut is assigned by default.

Screenshot_20250525_080016

Bugs fixed

BUG: 406130

Edited by Kai Uwe Broulik

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