Replaces the helix-based stripe (which looked like a squiggling twisted
pair) with short perpendicular tick marks centered on the wire body,
spaced every 8px. This gives the characteristic slash/stripe appearance
of real striped wire, contained within the wire width.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Stripe color is now drawn as a single spiral wrapping around the solid
wire body (using the same quadratic-bezier helix as twisted pair) rather
than a dashed overlay. Pitch is fixed at 20px for stripes. Updated all
three rendering paths: _renderWire, _recomputeJumps, _redrawWiresFor.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>