feat(render): solid fill for PolyfaceMesh and PolygonMesh entities

PolyfaceMesh and PolygonMesh were wireframe-only. They now render with
the same flat-color solid fill as Face3D entities.

- Add fill_tris: Vec<[f32;3]> to TruckEntity and WireModel
- PolyfaceMesh: fan-triangulate each face into fill_tris
- PolygonMesh: triangulate each grid quad into fill_tris
- tessellate.rs Lines branch: apply world_offset to fill_tris
- Face3DGpu::from_wires: collect fill_tris from all wires in addition
  to Face3D key_vertices quads
- upload_face3d: pass all_wires so fill_tris are batched into one draw call

src/modules/annotate/aligned_dim.rs

@@ -104,6 +104,7 @@ impl CadCommand for AlignedDimensionCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }
@@ -140,5 +141,6 @@ fn preview_aligned(p1: Vec3, p2: Vec3, dim_pt: Vec3) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }

src/modules/annotate/angular_dim.rs

@@ -127,6 +127,7 @@ fn preview_wire(points: Vec<Vec3>) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }
 

src/modules/annotate/diameter_dim.rs

@@ -103,5 +103,6 @@ fn preview_line(a: Vec3, b: Vec3) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }

src/modules/annotate/dim_baseline.rs

@@ -145,6 +145,7 @@ impl CadCommand for DimBaselineCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }

src/modules/annotate/dim_continue.rs

@@ -142,6 +142,7 @@ impl CadCommand for DimContinueCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }

src/modules/annotate/dimjogline.rs

@@ -96,6 +96,7 @@ impl CadCommand for DimJogLineCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }

src/modules/annotate/dimtedit.rs

@@ -104,6 +104,7 @@ impl CadCommand for DimTeditCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 

src/modules/annotate/leader_cmd.rs

@@ -204,6 +204,7 @@ fn preview_wire(pts: &[Vec3]) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }
 

src/modules/annotate/linear_dim.rs

@@ -115,6 +115,7 @@ fn preview_wire(points: Vec<Vec3>) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }
 

src/modules/annotate/mleader_cmd.rs

@@ -157,6 +157,7 @@ fn preview_wire(pts: &[Vec3]) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }
 

src/modules/annotate/mleader_edit.rs

@@ -368,6 +368,7 @@ fn preview_wire(pts: &[Vec3]) -> WireModel {
         aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }
 

src/modules/annotate/qdim.rs

@@ -101,6 +101,7 @@ impl CadCommand for QdimCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }

src/modules/annotate/radius_dim.rs

@@ -114,5 +114,6 @@ fn preview_wire(points: Vec<Vec3>) -> WireModel {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
     }
 }

src/modules/annotate/table_cmd.rs

@@ -147,6 +147,7 @@ impl CadCommand for TableCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
             })
         } else {
             None

src/modules/annotate/tolerance_cmd.rs

@@ -100,6 +100,7 @@ impl CadCommand for ToleranceCommand {
             aabb: WireModel::UNBOUNDED_AABB,
             plinegen: true,
             vp_scissor: None,
+            fill_tris: vec![],
         })
     }
 }