Make the editor use the remaining page height

src/editor/GraphEditor.ts

@@ -464,6 +464,14 @@ export class GraphEditor extends HTMLElement {
   private fireOnChange() {
     this.dispatchEvent(new Event('change'));
   }
+
+  override get clientWidth(): number {
+    return this.children[0].clientWidth;
+  }
+
+  override get clientHeight(): number {
+    return this.children[0].clientHeight;
+  }
 }
 
 type NodeSelection = d3.Selection<