A failed load left the loading flag set, so the grid drew points until
the page reloaded; the next build now tries again. The shader's dot edge
is now a linear ramp of about one device pixel, closer to the points'
coverage than smoothstep was. dot_lattice_test paints the grid both ways
in the test runner and holds the shader to the same dots in the same
places: no pixel more than 48/255 apart away from the edges, total ink
within 8% (both found by Greptile).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>