feat: implement sidebar docked call panel with participant management and sync status handling

src/app/pages/client/ClientRoot.tsx

@@ -32,7 +32,6 @@ import { SpecVersions } from './SpecVersions';
 import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
 import { useSyncState } from '../../hooks/useSyncState';
 import { stopPropagation } from '../../utils/keyboard';
-import { SyncStatus } from './SyncStatus';
 import { AuthMetadataProvider } from '../../hooks/useAuthMetadata';
 import { getFallbackSession } from '../../state/sessions';
 import { CallProviderWrapper } from '../../features/call/CallProviderWrapper';
@@ -282,7 +281,6 @@ export function ClientRoot({ children }: ClientRootProps) {
   return (
     <SpecVersions baseUrl={baseUrl!}>
       <TitleBar mx={mx} />
-      {mx && <SyncStatus mx={mx} />}
       {loading && <ClientRootOptions mx={mx} />}
       {(loadState.status === AsyncStatus.Error || startState.status === AsyncStatus.Error) && (
         <SplashScreen>