feat: call desk redesign — 2-panel layout, collapsible sidebar, inline AI, ringtone

- Collapsible sidebar with Jotai atom (icon-only mode, persisted to localStorage)
- 2-panel call desk: worklist (60%) + context panel (40%) with AI + Lead 360 tabs
- Inline AI call prep card — known lead summary or unknown caller script
- Active call card with compact Answer/Decline buttons
- Worklist panel with human-readable labels, priority badges, click-to-select
- Context panel auto-switches to Lead 360 when lead selected or call incoming
- Browser ringtone via Web Audio API on incoming calls
- Sonner + Untitled UI IconNotification for toast system
- apiClient pattern: centralized post/get/graphql with auto-toast on errors
- Remove duplicate avatar from top bar, hide floating widget on call desk
- Fix Link routing in collapsed sidebar (was using <a> causing full page reload)
- Fix GraphQL field names: adStatus→status, platformUrl needs subfield selection
- Silent mode for DataProvider queries to prevent toast spam

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main.tsx

@@ -19,6 +19,7 @@ import { AuthProvider } from "@/providers/auth-provider";
 import { DataProvider } from "@/providers/data-provider";
 import { RouteProvider } from "@/providers/router-provider";
 import { ThemeProvider } from "@/providers/theme-provider";
+import { Toaster } from "@/components/application/notifications/toaster";
 import "@/styles/globals.css";
 
 createRoot(document.getElementById("root")!).render(
@@ -57,5 +58,6 @@ createRoot(document.getElementById("root")!).render(
                 </DataProvider>
             </AuthProvider>
         </ThemeProvider>
+        <Toaster />
     </StrictMode>,
 );