The dialog ranked layers by selection (priority 3 for the picked path, 2 for the
rest), so every ↑↓ re-elected the spine and re-laid the whole graph out. Rank by
first-heard order instead and move `emphasis`, the way the node detail's Routes
tab already does — the geometry is fixed by evidence, only the white lane moves.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>