feat(render): relative-to-eye for mesh, image, face3d and hatch pipelines

Switch the remaining world-space shaders (mesh, image, face3d, hatch,
hatch_batched) to the same relative-to-eye transform the wire pipeline
uses: subtract the eye (high+low f32) per vertex and multiply by the
rotation-only view-projection. Each shader's Uniforms struct is widened
to the full shared layout so the appended RTE fields land at the correct
offsets. Math is unchanged (proj·R·(pos−eye)); large coordinates no
longer jitter on camera movement.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/shaders/image.wgsl

@@ -12,6 +12,12 @@ struct Uniforms {
     flat_shade:         f32,
     transparency_enable: f32,
     _pad:               vec2<f32>,
+    // Relative-to-eye (double-single): see wire.wgsl.
+    view_rot:           mat4x4<f32>,
+    eye_high:           vec3<f32>,
+    _pad_eh:            f32,
+    eye_low:            vec3<f32>,
+    _pad_el:            f32,
 };
 
 @group(0) @binding(0) var<uniform> u: Uniforms;
@@ -46,7 +52,7 @@ struct VertOut {
 @vertex
 fn vs_main(in: VertIn) -> VertOut {
     var out: VertOut;
-    out.clip_pos = u.view_proj * vec4<f32>(in.pos, 1.0);
+    out.clip_pos = u.view_rot * vec4<f32>((in.pos - u.eye_high) - u.eye_low, 1.0);
     out.clip_pos.z = out.clip_pos.z - img_params.draw_depth * DRAW_ORDER_BIAS * out.clip_pos.w;
     out.uv = in.uv;
     return out;