Operable controls (Fast Shutter, State, p-group, Session) group right
via addPermanentWidget and share one hover affordance - hand cursor +
underline - now owned by ClickableLabel; ValueLabel opts out for the
passive readouts, and the unwired busy label becomes a plain QLabel.
Cryo sits first in the operable group but stays passive: a cryo
operation is planned (TODO in status_bar.py), the placement just
reserves its spot.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
duan_jandClaude Fable 5
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