Channel drawing now works like line drawing:
- First click places primary horizontal line (3 anchors)
- Mouse move shows dotted parallel preview line
- Second click places parallel line (1 center anchor)
Channel anchor behavior:
- Primary line center anchor: moves both lines together
- Primary line end anchors: pivots both lines (stays parallel)
- Secondary line center anchor: adjusts distance to primary
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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