fix: order DO_TRY sections as try-body, finally, catch and reduce spacing

ELK TB layout places children in insertion order. Now explicitly adds
DO_FINALLY before DO_CATCH so the visual order inside DO_TRY is:
try body (top) → finally → catch blocks (bottom). Also reduces
internal spacing to keep the compound more compact.

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

@@ -549,8 +549,8 @@ public class ElkDiagramRenderer implements DiagramRenderer {
             elkNode.setHeight(100);
             elkNode.setProperty(CoreOptions.ALGORITHM, "org.eclipse.elk.layered");
             elkNode.setProperty(CoreOptions.DIRECTION, Direction.DOWN);
-            elkNode.setProperty(CoreOptions.SPACING_NODE_NODE, NODE_SPACING * 0.6);
+            elkNode.setProperty(CoreOptions.SPACING_NODE_NODE, NODE_SPACING * 0.4);
-            elkNode.setProperty(CoreOptions.SPACING_EDGE_NODE, EDGE_SPACING * 0.5);
+            elkNode.setProperty(CoreOptions.SPACING_EDGE_NODE, EDGE_SPACING * 0.3);
             elkNode.setProperty(CoreOptions.PADDING,
                     new org.eclipse.elk.core.math.ElkPadding(COMPOUND_TOP_PADDING,
                             COMPOUND_SIDE_PADDING, COMPOUND_SIDE_PADDING, COMPOUND_SIDE_PADDING));
@@ -590,12 +590,22 @@ public class ElkDiagramRenderer implements DiagramRenderer {
                 }
             }
 
-            // Handler children are direct children of DO_TRY (stacked below)
+            // Handler children stacked below try body: DO_FINALLY first, then DO_CATCH
+            // (ELK TB layout places children in insertion order)
             for (RouteNode child : handlerChildren) {
+                if (child.getType() == NodeType.DO_FINALLY) {
                     childNodeIds.add(child.getId());
                     createElkNodeRecursive(child, elkNode, factory, elkNodeMap, nodeColors,
                             compoundNodeIds, childNodeIds, doTryNodeIds);
                 }
+            }
+            for (RouteNode child : handlerChildren) {
+                if (child.getType() == NodeType.DO_CATCH) {
+                    childNodeIds.add(child.getId());
+                    createElkNodeRecursive(child, elkNode, factory, elkNodeMap, nodeColors,
+                            compoundNodeIds, childNodeIds, doTryNodeIds);
+                }
+            }
         } else if (isCompound) {
             compoundNodeIds.add(rn.getId());
             elkNode.setWidth(200);
@@ -661,9 +671,18 @@ public class ElkDiagramRenderer implements DiagramRenderer {
                             wrapperChildren));
                     compoundInfos.put(wrapperId, new CompoundInfo(wrapperId, Color.WHITE));
                 }
-                // Handler children (DO_CATCH, DO_FINALLY)
+                // Handler children: DO_FINALLY first, then DO_CATCH
                 for (RouteNode child : rn.getChildren()) {
-                    if (child.getType() == NodeType.DO_CATCH || child.getType() == NodeType.DO_FINALLY) {
+                    if (child.getType() == NodeType.DO_FINALLY) {
+                        ElkNode childElk = elkNodeMap.get(child.getId());
+                        if (childElk != null) {
+                            children.add(extractPositionedNode(child, childElk, elkNodeMap,
+                                    compoundNodeIds, compoundInfos, rootNode));
+                        }
+                    }
+                }
+                for (RouteNode child : rn.getChildren()) {
+                    if (child.getType() == NodeType.DO_CATCH) {
                         ElkNode childElk = elkNodeMap.get(child.getId());
                         if (childElk != null) {
                             children.add(extractPositionedNode(child, childElk, elkNodeMap,