Register erBox shape

packages/mermaid/src/rendering-util/rendering-elements/shapes.ts

@@ -55,6 +55,7 @@ import { triangle } from './shapes/triangle.js';
 import { waveEdgedRectangle } from './shapes/waveEdgedRectangle.js';
 import { waveRectangle } from './shapes/waveRectangle.js';
 import { windowPane } from './shapes/windowPane.js';
+import { erBox } from './shapes/erBox.js';
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type ShapeHandler = (parent: any, node: Node, options: ShapeRenderOptions) => unknown;
@@ -442,6 +443,14 @@ export const shapesDefs: ShapeDefinition[] = [
     aliases: ['lined-document'],
     handler: linedWaveEdgedRect,
   },
+  {
+    semanticName: 'Entity Relationship Box',
+    name: 'Entity Relationship Box',
+    shortName: 'erBox',
+    description: 'Entity Relationship Box',
+    aliases: ['er-box'],
+    handler: erBox,
+  },
 ];
 
 const generateShapeMap = () => {