Initial import: open-design source for helix-mind.ai distribution

This repository contains the open-design daemon CLI source code, built
and packaged at https://helix-mind.ai/cli/open-design/latest.tgz for use
by the HelixMind /design slash command.

Licenses: Apache-2.0 (root) + MIT (skills/*)

apps/web/public/od-notifications-sw.js

@@ -0,0 +1,39 @@
+// Browser service workers must be served as JavaScript files. This tiny
+// runtime exists only to display task-completion notifications and focus
+// the existing Open Design tab when the user clicks one.
+self.addEventListener('notificationclick', (event) => {
+  event.notification.close();
+
+  const data = event.notification.data || {};
+  const targetUrl = typeof data.url === 'string' ? data.url : self.location.origin;
+
+  event.waitUntil((async () => {
+    const windows = await self.clients.matchAll({
+      type: 'window',
+      includeUncontrolled: true,
+    });
+    const sameOrigin = windows.find((client) => {
+      try {
+        return new URL(client.url).origin === self.location.origin;
+      } catch {
+        return false;
+      }
+    });
+
+    if (sameOrigin) {
+      if ('navigate' in sameOrigin) {
+        try {
+          await sameOrigin.navigate(targetUrl);
+        } catch {
+          /* focus the existing tab below */
+        }
+      }
+      return sameOrigin.focus();
+    }
+
+    if (self.clients.openWindow) {
+      return self.clients.openWindow(targetUrl);
+    }
+    return undefined;
+  })());
+});