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/src/components/messenger.tsx

@@ -12,7 +12,7 @@ import { ThreadPane } from './thread-pane';
  * with a channel browser when the adapter supports channels. Owns only selection + browse state;
  * all data flows through the injected adapter via the hooks.
  */
-export function Messenger() {
+export function Messenger({ focusThreadId }: { focusThreadId?: string | null } = {}) {
   const { conversations, loading, error, refetch } = useConversations();
   const adapter = useAdapter();
   const channelsSupported = typeof adapter.browseChannels === 'function';
@@ -32,6 +32,14 @@ export function Messenger() {
   // Switching conversations (or into browse/compose) closes any open thread pane.
   useEffect(() => setActiveRoot(null), [selected, browsing, composing]);
 
+  // Deep link (e.g. from global search): focus the requested conversation.
+  useEffect(() => {
+    if (!focusThreadId) return;
+    setBrowsing(false);
+    setComposing(false);
+    setSelected(focusThreadId);
+  }, [focusThreadId]);
+
   const channels = useMemo(() => conversations.filter((c) => c.membership === 'channel'), [conversations]);
   const dms = useMemo(() => conversations.filter((c) => c.membership !== 'channel'), [conversations]);
   const selectedConversation = useMemo(() => conversations.find((c) => c.threadId === selected) ?? null, [conversations, selected]);