fix: only skip DO_TRY edges to internal children, keep continuation edges

The previous fix skipped ALL edges from DO_TRY nodes, which also
removed the continuation edge to the next node in the main flow
(causing LOG nodes to appear disconnected). Now checks if the target
is a descendant of the DO_TRY ELK node — only internal edges are
skipped, continuation edges to the next main flow node are kept.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java

@@ -295,19 +295,20 @@ public class ElkDiagramRenderer implements DiagramRenderer {
         // Create ELK edges — skip edges that cross between different ELK root graphs
         if (graph.getEdges() != null) {
             for (RouteEdge re : graph.getEdges()) {
-                // Skip all edges originating from DO_TRY nodes — these are entry/handler
-                // edges that don't need layout (try body has its own internal flow,
-                // handler edges are like route-level ON_EXCEPTION edges)
-                if (doTryNodeIds.contains(re.getSource())) {
-                    continue;
-                }
-
                 ElkNode sourceElk = elkNodeMap.get(re.getSource());
                 ElkNode targetElk = elkNodeMap.get(re.getTarget());
                 if (sourceElk == null || targetElk == null) {
                     continue;
                 }
 
+                // Skip edges from DO_TRY to its own children (entry + handler edges).
+                // Keep edges from DO_TRY to nodes OUTSIDE it (continuation edges).
+                if (doTryNodeIds.contains(re.getSource())) {
+                    if (isDescendantOf(targetElk, sourceElk)) {
+                        continue;
+                    }
+                }
+
                 // Skip edges that cross ELK root boundaries
                 ElkNode sourceRoot = getElkRoot(sourceElk);
                 ElkNode targetRoot = getElkRoot(targetElk);
@@ -717,6 +718,16 @@ public class ElkDiagramRenderer implements DiagramRenderer {
     // ----------------------------------------------------------------
 
     /** Walk up to the top-level root of an ELK node's hierarchy. */
+    /** Check if 'child' is a descendant of 'ancestor' in the ELK node hierarchy. */
+    private boolean isDescendantOf(ElkNode child, ElkNode ancestor) {
+        ElkNode current = child.getParent();
+        while (current != null) {
+            if (current == ancestor) return true;
+            current = current.getParent();
+        }
+        return false;
+    }
+
     private ElkNode getElkRoot(ElkNode node) {
         ElkNode current = node;
         while (current.getParent() != null) {