✨ feat: add loading bar and toast notification system with responsive design

frontend/src/lib/actions/portal.ts

@@ -0,0 +1,18 @@
+/**
+ * Portal action — teleports an element to document.body.
+ * Usage: <div use:portal>…</div>
+ * SSR-safe: only runs when document is available.
+ */
+export function portal(node: HTMLElement) {
+    if (typeof document === "undefined") return
+
+    document.body.appendChild(node)
+
+    return {
+        destroy() {
+            if (node.parentNode) {
+                node.parentNode.removeChild(node)
+            }
+        },
+    }
+}