feat(render): relative-to-eye for the wire pipeline

The wire shader now subtracts the eye (high+low f32) per endpoint and
transforms by the rotation-only view-projection instead of multiplying
absolute positions by a view-projection that bakes in a large eye
translation. The math is identical (proj·R·(pos−eye)) but the large eye
no longer enters the f32 matrix, so lines stop jittering on
pan/zoom/rotate at large (UTM) coordinates and far from world_offset.

Geometry low bits are intentionally dropped: (pos − eye_high) is exact in
f32 for same-magnitude operands (Sterbenz) and eye_low corrects the eye,
so the only residual is a static sub-f32 position error, not motion
jitter — no per-vertex low buffer needed. view_rot is cropped in lock-step
with view_proj for tiled panes.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/scene/view/render.rs

@@ -744,6 +744,9 @@ impl Scene {
         let mut uniforms =
             Uniforms::new(&inst.camera, full_bounds, self.document.header.lineweight_display);
         uniforms.view_proj = crop_view_proj(uniforms.view_proj, uo, vo, us, vs);
+        // The RTE matrix is a view-projection too, so the same clip-space crop
+        // applies — keep it in lock-step with view_proj for tiled / sub-rect panes.
+        uniforms.view_rot = crop_view_proj(uniforms.view_rot, uo, vo, us, vs);
         uniforms.viewport_size = [visible_w, visible_h];
         uniforms.flat_shade = if flags.flat_shade { 1.0 } else { 0.0 };
         uniforms.transparency_enable = if self.transparency_display { 1.0 } else { 0.0 };