Neither chart drew anything. createBoardMap already awaits the map's load event
and resolves after it, so attaching a second load handler waited for something
that had already happened: the layer setup never ran, each map held only its
basemap layers, and the panel showed an empty whiteboard.
It failed silently, which is why the visible-failure branch did not catch it.
Nothing threw — the map was fine, the source was simply never added. A guard that
reports errors cannot report an absence of work.
The setup now runs directly after the await, and still binds once('load') if a
future engine resolves earlier. That keeps the fix correct rather than merely
right today.
The figures also grow from a zero basis instead of from their content. The map
inside is absolutely positioned and has no intrinsic width, so a basis of auto
asks for a content size of nothing and the legend takes the column — the figure
was measured at 39 pixels across while the decoder had the rest. This was hidden
behind the first bug: an empty chart and a chart with no room look the same.
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