Add tool.Array.is_array_child helper. Port decorator and MEP
action gizmos (lock, pen, join) hide on array children — writes
on children get wiped by the next regen, and the port topology
is inherited from the parent.
Introduce tool.Array.select_only_parent and wire it into both
bim.regenerate_array and bim.finish_editing_array so post-regen
state converges on parent-only-selected + active. Grow and shrink
paths otherwise diverge (grow left new children selected alongside
the parent; shrink left only the parent).
Relates to #8088.
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Gorgious56
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