visual/UI indicator for turbo/smartcast mode toggle

Imported from legacy Flarum.
Original author: kkdm (Flarum #1324)

Title:

add a visual indicator to show when turbo is on/off

Description:
I love the turbo/smartcast feature, it’s amazing and makes the game so much more enjoyable. Actually life-changing, lol. The last thing it needs IMO is some kind of indicator somewhere on the UI that it’s toggled on/off. Buff bar would be last resort but usable, probably. What I had in mind is changing the color of the skill bar or adding a small mark or icon somewhere that toggles on/off depending on whether turbo is on.

Why is this a good idea?
despite using turbo all the time, I still forget when it’s on/off and testing it before I type something is really tedious. Still, it’s such a good feature that I use it anyway!

What risks or downsides does it have?
downsides: probably requires more custom code

Imported from legacy Flarum.
Original author: Dovezin (Flarum #1094)

Add an indicator that Turbo is enabled - MuhRO Forum