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/data_link.rs

@@ -134,7 +134,9 @@ impl DataLinkPlaceCommand {
             plinegen: true,
             fill_tris: Vec::new(),
             fill_tris_low: Vec::new(),
-        }
+        
+            ..Default::default()
+}
     }
 }