feat(pdf): searchable text layer with per-style subset font embedding

Real BT/Tj text objects ride alongside the vector outlines (Tr 3,
zero visual change): runs preserved at layout time, TTF styles embedded
as allsorts subsets with ToUnicode, width-matched Tm, clip-culled.
WireModel literals moved to ..Default::default() tails.

src/modules/draw/draw/attdef.rs

@@ -235,7 +235,9 @@ impl CadCommand for AttdefCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 }
 

src/modules/draw/draw/mline.rs

@@ -213,7 +213,9 @@ impl MlineCommand {
             plinegen: true,
             fill_tris,
             fill_tris_low,
-        })
+        
+            ..Default::default()
+})
     }
 }
 

src/modules/draw/draw/raster_image.rs

@@ -202,7 +202,9 @@ impl CadCommand for ImageCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 }
 

src/modules/draw/draw/ray.rs

@@ -119,7 +119,9 @@ impl CadCommand for RayCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 }
 
@@ -408,7 +410,9 @@ impl CadCommand for XLineCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 }
 

src/modules/draw/inquiry/area.rs

@@ -401,7 +401,9 @@ impl CadCommand for AreaCommand {
             plinegen: true,
             fill_tris: Vec::new(),
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 
     fn area_preview_regions(&self) -> Option<Vec<AreaPreviewRegion>> {

src/modules/draw/inquiry/dist.rs

@@ -124,7 +124,9 @@ impl CadCommand for DistCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 }
 

src/modules/draw/inquiry/measuregeom.rs

@@ -103,7 +103,9 @@ impl MeasureGeomCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        }
+        
+            ..Default::default()
+}
     }
 
     /// Extract (radius) from a Circle or Arc; `None` for anything else.

src/modules/draw/modify/trim.rs

@@ -4870,7 +4870,9 @@ fn preview_wire(points: Vec<[f32; 3]>, color: [f32; 4], name: &str) -> WireModel
         plinegen: true,
         fill_tris: vec![],
         fill_tris_low: Vec::new(),
-    }
+    
+        ..Default::default()
+}
 }
 
 /// Insert the exact boundary crossings between consecutive samples so a