The "Technique" region: the current rep's charts, or a skeleton when none is
selected. Reserves the charts' last-measured height while showing the
skeleton, so the scroll container never collapses under the user's scroll
offset — they can scroll to a chart and keep watching it at that position
while scrubbing across reps (and rest gaps) through the whole set.
The "Technique" region: the current rep's charts, or a skeleton when none is selected. Reserves the charts' last-measured height while showing the skeleton, so the scroll container never collapses under the user's scroll offset — they can scroll to a chart and keep watching it at that position while scrubbing across reps (and rest gaps) through the whole set.