[andrinr]

Fixes the shading artifacts in the B-rep inspector on scenes/starter.py: glows on flat faces, a wrinkle on the blend around the fin-root pocket, and streaks on the left pin.

Cause. The inspector's faces replace the raymarched solid: the solid is hidden and depth is cleared. So neither depth fighting with the SDF surface nor the AO and outline passes play a part. With the payload intercepted, the glows appeared with the served corner normals and never with flat facet normals. There were two causes:

1. fs_brep took its eye vector from the camera point, normalize(camera_pos - world). The viewer's default orthographic projection has parallel rays, so that vector varied across a plane, and a flat face shaded as a radial gradient. The overlay uniform gains view_dir: the camera's forward axis, with w = 1 when orthographic. The block grows from 112 to 128 bytes. fs_brep uses that direction under orthographic projection and the eye point under perspective. The static bundle is rebuilt.
2. The corner normals served by diff-brep had mixed signs within a triangle and stepped on blends. That is fixed in andrinr/diff-brep#18.

Verified

• At identical camera views before and after (origin/main with diff-brep main vs this branch with diff-brep#18): the plane glows and pin streaks are gone, and the pocket wrinkle is reduced.
• tests/viewer/test_brep_inspector.py: 11 passed. vitest 717 passed, tsc clean.
• e2e brepInspector.spec.ts and gpu.spec.ts pass.
• A fresh vite build reproduces the committed bundle.

Left

• A thin light line on the blend along the wall base. It follows a real fillet that the raymarched solid shows too.
• Edge strokes look dashed at the pin rim and base (edge-versus-face depth nudge).
• The blend face spans areas that are geometrically planar, which is diff-brep face segmentation.

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