fix: AIUI mobile — auto-switch to content tab when clicking chat bubbles

Removed !isEmbedded guard from mobile tab auto-switch watchers in
ChatPage.vue. When running embedded in Archy iframe on mobile,
clicking a chat bubble now correctly switches to the content panel.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo/aiui/registerSW.js

@@ -1 +1 @@
-if('serviceWorker' in navigator) {window.addEventListener('load', () => {navigator.serviceWorker.register('/aiui/sw.js', { scope: '/aiui/' })})}
+if('serviceWorker' in navigator) {window.addEventListener('load', () => {navigator.serviceWorker.register('/sw.js', { scope: '/' })})}