Add functions when the application button is held down

[STVGecko]

Describe the solution you'd like Add functions when the application button is held down, as https://f-droid.org/packages/com.best.deskclock/

-New alarme/ring -New timer -Start the stopwatch

-screen saver (a mode that puts the screen to sleep with the time displayed)

[AhsanSarwar45]

I've added some shortcuts, refer to this https://github.com/vicolo-dev/chrono/issues/322#issuecomment-2365239238.