Bars rendered as ~1-15px because outer flex container had
align-items:flex-end which made each column shrink to label
height (~15.8px), so bar percentage heights resolved against
that instead of the intended 80px container.
Switched to align-items:stretch + fixed-pixel bar heights
anchored to a 60px area (reserves ~20px for label row). Each
column now uses justify-content:flex-end so bars + labels sit
at the bottom baseline.
