Feature: Tooltip fade in/out by x seconds

[kalnode]

Describe the feature

Problem: Currently on mobile, the tooltip persists after user has swiped the slider. Ideally it fades-out after x seconds. It makes much more sense than simply leaving the tooltip open.

If that's the case, there may as well be a general fade in/out for the tooltip, which would be a better aesthetic on desktop as well (which currently instantly shows/hides the tooltip).

1. Implement a fade in/out transition for the tooltip
2. Implement fade timer option, where the tooltip shall remain open until x time passed (most relevant on mobile)