Add persisted per-view port anchors and connection-aware border placement

crates/oa-core/src/references.rs

@@ -187,6 +187,11 @@ pub fn remap_references(p: &mut Project, old: Id, new: Id) {
             }
         }
         for n in d.nodes.values_mut() {
+            for anchor in &mut n.port_anchors {
+                if anchor.port == old {
+                    anchor.port = new;
+                }
+            }
             if n.element == old {
                 n.element = new;
             }
@@ -345,6 +350,10 @@ fn remove_objects(p: &mut Project, removed: BTreeSet<Id>) {
     for d in p.diagrams.values_mut() {
         d.nodes.retain(|id, _| !removed.contains(id));
         d.routes.retain(|route| !removed.contains(&route.edge));
+        for node in d.nodes.values_mut() {
+            node.port_anchors
+                .retain(|anchor| !removed.contains(&anchor.port));
+        }
     }
     let clear = |v: &mut Option<Id>| {
         if v.is_some_and(|id| removed.contains(&id)) {