No generated leaf page has ever carried an @media print rule — measured across
the tree: zero, out of 63. Two consequences, both on every plugin:
The page background is #0a0e15. Browsers drop background colours by default, so
this is invisible until a reader ticks "Background graphics" to get the MAP on
paper — and that reader, the one who most wants the printout, gets the sheet
flooded black around it.
#status is the loading overlay: position:fixed, inset:0, above everything. It
is emptied once the element mounts, but it is still a full-sheet layer, and a
page printed before or during load prints "loading…" over content that did in
fact load. It is hidden only while it is NOT an error: an error still prints,
because a blank sheet with the explanation suppressed is worse than a sheet
that says what went wrong.
Deliberately NOT in this commit: releasing the leaf's position:fixed. The bare
leaf pins the element with `#slot, <tag> { position:fixed; inset:0 }`, which is
why a standalone dashboard still prints one screenful even after its own print
rules landed — a shadow root cannot restyle its host's document rule. Releasing
it would make a full-bleed map leaf resolve its height against auto and could
print an empty box, so the discriminator is not `isMap` (region-dashboards is
isMap:true and is a scrolling dashboard, not a full-bleed map) and I will not
guess one from source. It needs one printed page looked at first.
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