Found by the bug-CLASS sweep, which is the point of doing one: the busy
indicator was added to the selection HUD after a report that pressing its
buttons showed no sign of work, and the legend's Export menu -- Poster and
Packet -- had none at all. Same defect, different surface, and I fixed the
reported instance without looking for its siblings.
Both do the same slow work: two dynamic imports, a map-SVG fetch, a funnel
fetch, then a multi-sheet render. onLegendExport now guards re-entry (a
second click would run two renders over one print frame), sets busyAction
so the control says what it is doing, and clears in finally on every exit
path including the early return inside the try.
The gate's busy assertion had two holes that let this through, and both
are fixed. It counted setters by matching the literal strings 'packet' and
'poster', so a ternary assignment was invisible -- a regex that enumerates
the shapes it knows about will always miss the next one, so it now matches
the assignment and excludes the clear. And it only asserted a whole-file
count, which "some handler somewhere sets it" satisfies; it now asserts
PER FUNCTION for all three print paths, so a surface cannot be forgotten
while the file as a whole looks fine.
Mutation-tested: removing the busy handling from onLegendExport now fails
naming that function, and dropping a finally fails naming its own.
Also drops a stale "page 3" from a shipped CSS comment -- page order is
variant-dependent since lightweight started omitting two sheets, so a
fixed page number in the output is wrong even where no reader sees it.
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