fix(plot): align layout output with viewport

Keep nested model hatches, PAT origins and dots, and Layout lineweight scaling consistent across screen and vector output.\n\nRefs #618

src/ui/window/plot.rs

@@ -681,7 +681,7 @@ pub fn view_window(
             "Scale lineweights",
             s.scale_lw && !s.fit_to_paper,
             PlotFlag::ScaleLw,
-            common_area && !s.fit_to_paper,
+            !s.fit_to_paper,
         ),
     ].spacing(7));