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/dashboard.tsx

@@ -24,6 +24,13 @@ import "../../app/dashboard/dashboard.css";
 export function Dashboard() {
   const [theme, setTheme] = useState<"dark" | "light">("dark");
   const [active, setActive] = useState("dashboard");
+  // Deep link from global search: which conversation to focus once we switch tabs.
+  const [deepLink, setDeepLink] = useState<{ surface: "messenger" | "inbox"; threadId: string } | null>(null);
+
+  function navigateToConversation(surface: "messenger" | "inbox", threadId: string) {
+    setActive(surface);
+    setDeepLink({ surface, threadId });
+  }
 
   useEffect(() => {
     // Sync the persisted theme from localStorage (an external system) on mount.
@@ -42,15 +49,15 @@ export function Dashboard() {
     <div className="dash-root" data-theme={theme}>
       <Sidebar active={active} onSelect={setActive} />
       <div className="dash-main">
-        <Topbar theme={theme} onToggle={toggle} title={title} subtitle={subtitle} />
+        <Topbar theme={theme} onToggle={toggle} title={title} subtitle={subtitle} onNavigate={navigateToConversation} />
         <div className="dash-content">
           <ToastProvider>
             {active === "profile" ? <Profile />
               : active === "support" ? <Support />
               : active === "rules" ? <Rules />
               : active === "ai" ? <AiAssistant />
-              : active === "messenger" ? <MessengerSdk />
-              : active === "inbox" ? <InboxSdk />
+              : active === "messenger" ? <MessengerSdk focusThreadId={deepLink?.surface === "messenger" ? deepLink.threadId : null} />
+              : active === "inbox" ? <InboxSdk focusThreadId={deepLink?.surface === "inbox" ? deepLink.threadId : null} />
               : active === "settings" ? <Settings />
               : active === "gallery" ? <SmartGallery theme={theme} />
               : active === "team" ? <TeamManagement />