First working POC

src/lib/components/Portal.svelte

@@ -0,0 +1,29 @@
+<script lang="ts">
+  interface Props {
+    children: any;
+  }
+
+  let { children }: Props = $props();
+
+  /**
+   * Portal action - moves the DOM node to document.body
+   * This escapes any overflow clipping boundaries
+   */
+  function portal(node: HTMLElement) {
+    const container = document.createElement('div');
+    document.body.appendChild(container);
+    container.appendChild(node);
+
+    return {
+      destroy() {
+        if (container.parentNode) {
+          document.body.removeChild(container);
+        }
+      }
+    };
+  }
+</script>
+
+<div use:portal>
+  {@render children()}
+</div>