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- Add close X button to all modal headers (acts as Cancel) - Replace Cancel/Save labels with icon buttons (✕/✓) - Remove header/footer separator lines, reduce spacing - Fix canvas re-render on resize via ResizeObserver - Move calibration hint to top as section-tip - Increase toggle zones to 16px, make borders more visible - Differentiate min/max ticks (long) from intermediate (short) - Sync toggle zones and ticks with span position - Fix span handle z-index to stay above LED input - Add total LED label click to toggle edge input visibility - Remove corner icon scale on hover - Direction arrows fixed at full-edge midpoint (unaffected by span) - Span bars fill full edge area with 2px border radius Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>