fix: left-align DO_TRY sections and shrink container to fit content

- Left-align all sections (try_body, doFinally, doCatch) within DO_TRY
- Shrink DO_TRY height to match actual content, removing bottom padding

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

@@ -326,6 +326,7 @@ public class ElkDiagramRenderer implements DiagramRenderer {
      */
     private void postProcessDoTrySections(LayoutContext ctx) {
         for (Map.Entry<String, List<String>> entry : ctx.doTrySectionOrder.entrySet()) {
+            String doTryId = entry.getKey();
             List<String> orderedIds = entry.getValue();
             List<ElkNode> sections = new ArrayList<>();
             for (String id : orderedIds) {
@@ -334,18 +335,29 @@ public class ElkDiagramRenderer implements DiagramRenderer {
             }
             if (sections.size() < 2) continue;
 
+            // Left-align all sections and stack vertically
             double startY = sections.stream().mapToDouble(ElkNode::getY).min().orElse(0);
             double spacing = 20;
             double currentY = startY;
             for (ElkNode section : sections) {
+                section.setX(COMPOUND_SIDE_PADDING);
                 section.setY(currentY);
                 currentY += section.getHeight() + spacing;
             }
 
+            // Uniform width
             double maxWidth = sections.stream().mapToDouble(ElkNode::getWidth).max().orElse(0);
             for (ElkNode section : sections) {
                 section.setWidth(maxWidth);
             }
+
+            // Shrink DO_TRY parent height to fit its content
+            ElkNode doTryNode = ctx.elkNodeMap.get(doTryId);
+            if (doTryNode != null) {
+                double contentBottom = currentY - spacing + COMPOUND_SIDE_PADDING;
+                doTryNode.setHeight(contentBottom);
+                doTryNode.setWidth(maxWidth + 2 * COMPOUND_SIDE_PADDING);
+            }
         }
     }