Use essential canvas boundaries and outline selected state rows

crates/oa-desktop/src/diagram.rs

@@ -1173,7 +1173,7 @@ impl canvas::Program<Message> for DiagramCanvas<'_> {
             } else if edge.trace {
                 Color::from_rgb8(134, 107, 168)
             } else {
-                Color::from_rgb8(144, 158, 173)
+                style::BOUNDARY
             };
             let capability_label = relationship_stereotype(project, edge.id);
             let mut stroke =
@@ -1596,7 +1596,11 @@ fn paint_node(f: &mut Frame, p: &Project, n: &ProjectedNode, selected: Id, conta
     };
     f.fill(&path, if container { tint } else { Color::WHITE });
     let mut stroke = Stroke::default()
-        .with_color(if e.id == selected { color } else { style::LINE })
+        .with_color(if e.id == selected {
+            color
+        } else {
+            style::BOUNDARY
+        })
         .with_width(if e.id == selected { 2.6 } else { 1.2 });
     if n.allocation_summary {
         stroke.line_dash = canvas::LineDash {