Right clicking on spectrogram or pitch graph sets playback position

[celeste-sinead]

This makes it quite easy to select a specific recently recorded sound to play back.

I chose right click because it's unused and wouldn't interact with the existing left-click behaviour. I'm kind of on the fence on what the best UX would be here - it is a little odd for right click to do this. Left-click-to-select seems more intuitive, but then either both the tooltip and the position selection are done at once, or the tooltip needs to move to a different button. :woman_shrugging: