v0.13.4-pl.1

Step 4 follow-up: widens the additive luft between adjacent axis labels from 0.5em to 1em on both axes.

The Y-axis labels were crowding together visibly at the previous constant. The wider gap also reduces how often N_y flips during an editor min-height drag, which mitigates the secondary label-jitter symptom — a full debouncing fix for the editor-only flicker is deferred.

Side effect: slightly fewer ticks on the X axis too, keeping horizontal and vertical breathing room consistent.

Single change: computeTickCount in src/blocks/elevation/geometry/ticks.ts now uses padding = em instead of padding = 0.5 * em.