Wall and fence endpoint-move affordances hard-snapped to the grid via a
hardcoded WALL_GRID_STEP and always ran Figma line-alignment, ignoring the
active snapping mode. Now:
- grid step follows getSegmentGridStep() (0 outside grid mode), so lines /
angles / off no longer force a grid snap the mode chip says is inactive;
- Figma alignment is gated on isMagneticSnapActive() (the lines mode);
- angles mode angle-locks the endpoint off the fixed corner (free length),
mirroring the draft tool;
- fence drops its legacy Shift-bypass to match the wall's unified model
(Alt stays as linked-segment detach).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
