Understudy Desktop v0.3.43

What's Changed

• Desktop training pane: visual polish (CTA clipping, scrollbar, stepper rhythm) by @lluisinthedesert in #364
• Rail toggle: Cmd+B shortcut + hover tooltip by @lluisinthedesert in #365
• release: Desktop 0.3.43 / CLI 0.6.40 by @lluisinthedesert in #366

Full Changelog: desktop-v0.3.42-mvp...desktop-v0.3.43-mvp