feat(render): double-single fills for the face3d pipeline

Table / PolyfaceMesh / greek-text / mleader-background fills go through
the face3d pipeline; their vertices were single f32 and quantized at UTM
scale. WireModel now carries a fill_tris_low residual (filled by the
tessellate Lines path), Face3DVertex gains position_low (location 3), and
face3d.wgsl reconstructs the eye-relative position from the pair. 3DFACE
quads built from key_vertices use a zero residual (no low source).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/draw/draw/attdef.rs

@@ -182,6 +182,7 @@ impl CadCommand for AttdefCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/ellipse.rs

@@ -627,6 +627,7 @@ fn line_wire(from: Vec3, to: Vec3) -> WireModel {
         plinegen: true,
         vp_scissor: None,
         fill_tris: vec![],
+        fill_tris_low: Vec::new(),
     }
 }
 

src/modules/draw/draw/line.rs

@@ -92,6 +92,7 @@ impl CadCommand for LineCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/mline.rs

@@ -147,6 +147,7 @@ impl CadCommand for MlineCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/raster_image.rs

@@ -124,6 +124,7 @@ impl CadCommand for ImageCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/ray.rs

@@ -90,6 +90,7 @@ impl CadCommand for RayCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }
@@ -172,6 +173,7 @@ impl CadCommand for XLineCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/revcloud.rs

@@ -96,6 +96,7 @@ impl CadCommand for RevCloudCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/draw/wipeout.rs

@@ -136,6 +136,7 @@ impl CadCommand for WipeoutCommand {
                     plinegen: true,
                     vp_scissor: None,
                     fill_tris: vec![],
+                    fill_tris_low: Vec::new(),
                 })
             }
             WipeoutMode::Polygonal => {
@@ -163,6 +164,7 @@ impl CadCommand for WipeoutCommand {
                     plinegen: true,
                     vp_scissor: None,
                     fill_tris: vec![],
+                    fill_tris_low: Vec::new(),
                 })
             }
         }

src/modules/draw/inquiry/area.rs

@@ -80,6 +80,7 @@ impl CadCommand for AreaCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }

src/modules/draw/inquiry/dist.rs

@@ -75,6 +75,7 @@ impl CadCommand for DistCommand {
             plinegen: true,
             vp_scissor: None,
             fill_tris: vec![],
+            fill_tris_low: Vec::new(),
         })
     }
 }