feat(messaging-ui): focusThreadId on Messenger + Inbox for search deep-links (0.1.6)

A host can pass focusThreadId to select/open a specific conversation — used by the
CRM's global search to jump to the exact thread. Mail switches to Open + selects the
matching item; messenger selects the thread. (Source for the already-published 0.1.6.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/iios-messaging-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@insignia/iios-messaging-ui",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",