revert: temporarily revert EIP_CIRCUIT_BREAKER compound rendering

Reverting e8039f9 to diagnose compound rendering regression affecting
all compound types (SPLIT, CHOICE, LOOP, DO_TRY) and error handlers.

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

ui/org/eclipse/elk/core/options/PortAlignment.java

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Kiel University and others.
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package org.eclipse.elk.core.options;
+
+/**
+ * Defines the distribution of ports.
+ *
+ * @author csp
+ */
+public enum PortAlignment {
+
+    /** Ports are evenly distributed, with the same amount of space between and around them. */
+    DISTRIBUTED,
+    
+    /** Ports are justified and use up all the space except for the surrounding ports spacing. */
+    JUSTIFIED,
+
+    /** Ports are placed at the most top respectively left position with minimal spacing. */
+    BEGIN,
+
+    /** Ports are centered with minimal spacing. */
+    CENTER,
+
+    /** Ports are placed at the most top respectively left position with minimal spacing. */
+    END;
+
+}

ui/src/components/ProcessDiagram/CompoundNode.tsx

@@ -65,8 +65,8 @@ export function CompoundNode({
     onNodeClick, onNodeDoubleClick, onNodeEnter, onNodeLeave,
   };
 
-  // _TRY_BODY / _CB_MAIN: transparent wrapper — no header, no border, just layout
-  if (node.type === '_TRY_BODY' || node.type === '_CB_MAIN') {
+  // _TRY_BODY: transparent wrapper — no header, no border, just layout
+  if (node.type === '_TRY_BODY') {
     return (
       <g transform={`translate(${x}, ${y})`}>
         {renderInternalEdges(internalEdges, absX, absY, executionOverlay)}
@@ -75,24 +75,6 @@ export function CompoundNode({
     );
   }
 
-  // _CB_FALLBACK: section styling with EIP purple
-  if (node.type === '_CB_FALLBACK') {
-    const fallbackColor = '#7C3AED'; // EIP purple
-    return (
-      <g data-node-id={node.id} transform={`translate(${x}, ${y})`}>
-        <rect x={0} y={0} width={w} height={h} rx={CORNER_RADIUS}
-          fill={fallbackColor} fillOpacity={0.06} />
-        <rect x={0} y={0} width={w} height={h} rx={CORNER_RADIUS}
-          fill="none" stroke={fallbackColor} strokeWidth={1} strokeOpacity={0.4} strokeDasharray="4 2" />
-        <text x={8} y={12} fill={fallbackColor} fontSize={10} fontWeight={600}>
-          fallback
-        </text>
-        {renderInternalEdges(internalEdges, absX, absY, executionOverlay)}
-        {renderChildren(node, absX, absY, childProps)}
-      </g>
-    );
-  }
-
   // DO_CATCH / DO_FINALLY: section-like styling (tinted bg, thin border, label)
   if (node.type === 'DO_CATCH' || node.type === 'DO_FINALLY') {
     const sectionLabel = node.type === 'DO_CATCH'

ui/src/components/ProcessDiagram/node-colors.ts

@@ -64,7 +64,6 @@ const COMPOUND_TYPES = new Set([
   'EIP_LOOP', 'EIP_MULTICAST', 'EIP_AGGREGATE',
   'ON_EXCEPTION', 'ERROR_HANDLER',
   'ON_COMPLETION',
-  'EIP_CIRCUIT_BREAKER', '_CB_MAIN', '_CB_FALLBACK',
 ]);
 
 const ERROR_COMPOUND_TYPES = new Set([