Chore: Restructure Repository for SvelteKit

_old/core/actions/index.ts

@@ -0,0 +1 @@
+export * from "./selectPortal";

_old/core/actions/selectPortal.ts

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+import type { Attachment } from "svelte/attachments";
+
+export function selectPortal(triggerEl: HTMLElement & { __selectMenuEl?: HTMLElement | null }): Attachment {
+  return (menuEl: HTMLElement) => {
+    function position() {
+      const zoom = parseFloat(document.documentElement.style.zoom) / 100 || 1;
+      const r = triggerEl.getBoundingClientRect();
+
+      const top  = r.bottom / zoom + 4;
+      const right = r.right / zoom;
+      const width = menuEl.offsetWidth;
+      const left = Math.max(8, right - width);
+
+      menuEl.style.position = "fixed";
+      menuEl.style.top      = `${top}px`;
+      menuEl.style.left     = `${left}px`;
+    }
+
+    menuEl.style.visibility = "hidden";
+    document.body.appendChild(menuEl);
+    triggerEl.__selectMenuEl = menuEl;
+
+    requestAnimationFrame(() => {
+      position();
+      menuEl.style.visibility = "";
+    });
+
+    window.addEventListener("scroll", position, true);
+    window.addEventListener("resize", position);
+
+    return () => {
+      window.removeEventListener("scroll", position, true);
+      window.removeEventListener("resize", position);
+      triggerEl.__selectMenuEl = null;
+      menuEl.remove();
+    };
+  };
+}