The panel's DEFAULT width when the user has never dragged it: the Activity tier
(SURFACE_PANEL_DEFAULT_WIDTH) normally, auto-widening to
clamp(380px, 44% of the overlay, 640px) while a content tab (artifact / channel)
is focused. An unknown overlay width (<= 0, NaN) resolves the wide tier to its
floor.
The panel's DEFAULT width when the user has never dragged it: the Activity tier (SURFACE_PANEL_DEFAULT_WIDTH) normally, auto-widening to
clamp(380px, 44% of the overlay, 640px)while a content tab (artifact / channel) is focused. An unknown overlay width (<= 0,NaN) resolves the wide tier to its floor.