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znetsixe a16f526964 chore(dashboardAPI): enforce min visual gap between threshold lines

User-visible problem: with the basin config dryRunThresholdPercent=2 (so
dryRunLevel ≈ outflowLevel) and highVolumeSafetyThresholdPercent=98 (so
highSafetyLevel ≈ overflowLevel), two pairs of threshold lines sat right
on top of each other in the tank visual, leaving no room between them for
their labels. The 'BELOW' fallback in the label algorithm couldn't fit
either, so labels ended up crossing lines.

Fix: enforce a minimum 28 px visual gap between adjacent threshold lines
inside the tank (≈3.7 % of the 760-tall reference frame, > LABEL_H + 2).
Lines closer than that get spread apart while preserving order. If the
stack would push the lowest line past the tank floor, the whole stack
shifts up to fit. Slight geometric distortion is accepted — the tank
visual conveys ordering and zone structure, not exact-scale level
measurement; numeric values are still rendered next to each line.

Result: at any basin geometry, labels sit cleanly above their line with
no overlap, no label-on-line collision, and no fallback to a 'stacked'
position that crosses its own line.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-28 17:52:19 +02:00