feat(search): global conversation search in the topbar with deep-link nav

Topbar search box → debounced crm.search → dropdown of hits (chat/mail, highlighted
snippet). Clicking a hit switches to the right tab and focuses the exact thread:
mail → Inbox, chat → Messenger (via the SDK's new focusThreadId, 0.1.6). Snippet HTML
is escaped except the <em> highlight. Demo mode searches an in-memory set.

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

src/components/dashboard/inbox-sdk.tsx

@@ -15,7 +15,7 @@ import type { DataDoor } from "@/lib/crm-messaging-adapter";
 
 const SHELL = isShellConfigured();
 
-export function InboxSdk() {
+export function InboxSdk({ focusThreadId }: { focusThreadId?: string | null } = {}) {
   return (
     <div className="view">
       {!SHELL && (
@@ -23,26 +23,26 @@ export function InboxSdk() {
           Demo mode — running on the SDK&apos;s mock inbox adapter.
         </div>
       )}
-      <div className="miu-host miu-host-inbox">{SHELL ? <LiveInbox /> : <DemoInbox />}</div>
+      <div className="miu-host miu-host-inbox">{SHELL ? <LiveInbox focusThreadId={focusThreadId} /> : <DemoInbox focusThreadId={focusThreadId} />}</div>
     </div>
   );
 }
 
-function DemoInbox() {
+function DemoInbox({ focusThreadId }: { focusThreadId?: string | null }) {
   const adapter = useMemo<InboxAdapter>(() => new MockInboxAdapter(), []);
   return (
     <InboxProvider adapter={adapter}>
-      <SdkInbox />
+      <SdkInbox focusThreadId={focusThreadId} />
     </InboxProvider>
   );
 }
 
-function LiveInbox() {
+function LiveInbox({ focusThreadId }: { focusThreadId?: string | null }) {
   const { sdk } = useAppShell();
   const adapter = useMemo<InboxAdapter>(() => new CrmInboxAdapter(sdk as unknown as DataDoor), [sdk]);
   return (
     <InboxProvider adapter={adapter}>
-      <SdkInbox />
+      <SdkInbox focusThreadId={focusThreadId} />
     </InboxProvider>
   );
 }