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/annotate/aligned_dim.rs

@@ -366,7 +366,9 @@ impl CadCommand for AlignedDimensionCommand {
             plinegen: true,
             fill_tris: vec![],
             fill_tris_low: Vec::new(),
-        })
+        
+            ..Default::default()
+})
     }
 
     fn dyn_spec(&self) -> Option<crate::command::DynSpec> {
@@ -482,7 +484,9 @@ fn preview_aligned(p1: DVec3, p2: DVec3, dim_pt: DVec3) -> WireModel {
         plinegen: true,
         fill_tris: vec![],
         fill_tris_low: Vec::new(),
-    }
+    
+        ..Default::default()
+}
 }