The ghost marker (route split indicator) was interfering with waypoint
dragging because it sat above waypoints (zIndexOffset 1000) and stayed
active during drag operations.
Adopt brouter-web's suspension pattern:
- Suspend route interaction on waypoint mouseover (not just dragstart),
unsuspend on mouseout — ghost marker hides before any click/drag
- Lower ghost marker zIndexOffset to -100 so waypoints always receive
clicks first
- Keep drag guards as a safety net
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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