2dd419dbf4
Reverts the tank-bigger approach from last commit. Instead of
scaling the tank and keeping strict proportionality, the dashed
threshold lines are now nudged apart directly so each gets a
guaranteed 36-px vertical gap. Inputs and labels align with the
lines (no more leader lines needed).
Trade-off: the diagram is now an ordered schematic, not a strictly
to-scale rendering. Values are still shown next to each line via
the input boxes, and the value ordering is preserved. For an editor
where the goal is entering parameters, readability wins over scale
fidelity.
Sizing reverted:
viewBox 620 → 430
tank h 520 → 340
botY 560 → 380
Behavior:
GAP 30 → 36 (more visible space between dashed lines)
placeItem takes a single y now (line + input + label + unit
share it); leader-line mechanism kept as hidden
plumbing in case we switch back to proportional later
Dead-volume band now anchors to the (possibly-nudged) outflow line
instead of the proportional y so it still visually meets the line
cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>