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/assets/channel-uO_MEpg2.js

@@ -0,0 +1 @@
+import{U as a,M as n}from"./mermaid.core-Bp72wBaC.js";const t=(r,o)=>a.lang.round(n.parse(r)[o]);export{t as c};