An unseated board dropped over a component was painted underneath it
(boards z 0, components z 1) and became impossible to grab back; the
earlier blanket z bump for boards broke the opposite case, hiding LEDs
and transistors behind every board. Neither static order can win both.
The rule is now the user's own gesture: the FIRST movement of a drag
raises that item (board or part, symmetrically) to the top of a
monotonic dragged-stack, so a board dropped over an LED sits visibly on
top — and dragging the LED afterwards wins the stack right back.
Click-select alone never raises: selection must not reshuffle a scene
you arranged. Untouched items keep the static layering (components
above unseated boards, seated boards above their socket), and the rank
map is ephemeral — never saved with the project.
cb26e36b28