UPG-100's map root now carries isolation:isolate, the containing layer
Simple Research's and the country map's .rm-root already have. Without it
the legend sheet (z-index 1000) competed directly with the gallery's round
menu button (z-index 15) and painted over it on the Map view: 0 of 5 hit
points on the button, collapsed and open, en + ar.
Isolated, the whole map area stacks as one layer and the button sits above
it, sheet included (5/5, both states, en + ar), as on those maps. The
isolation is on the map root only: the poster wall's modal scrim lives in
the other pane and still covers the button when a poster is printing,
which raising the button's z-index instead would have broken.
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