Redesign mobile time clock, add shortcuts, and improve account management.

Add iOS Shortcuts/Siri intents, local send-reminder notifications, stable
client picker with last-client defaults, account refresh/remove, and softer
session handling on unauthorized API responses.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/_layout.tsx

@@ -19,6 +19,7 @@ import { SafeAreaProvider } from "react-native-safe-area-context";
 
 import { BrandBackground } from "@/components/BrandBackground";
 import { LoadingScreen } from "@/components/LoadingScreen";
+import { SessionSync } from "@/components/SessionSync";
 import { AccountsProvider, useAccounts } from "@/contexts/AccountsContext";
 import { AuthProvider, useSession } from "@/contexts/AuthContext";
 import { ThemeProvider, useAppTheme } from "@/contexts/ThemeContext";
@@ -34,6 +35,7 @@ function AppServices({ children }: { children: ReactNode }) {
   return (
     <AuthProvider apiUrl={apiUrl} storagePrefix={authStoragePrefix} key={remountKey}>
       <TRPCProvider apiUrl={apiUrl} key={remountKey}>
+        <SessionSync />
         {children}
       </TRPCProvider>
     </AuthProvider>
@@ -95,13 +97,13 @@ export default function RootLayout() {
 }
 
 function RootNavigator() {
-  const { data: session, isPending } = useSession();
+  const { data: session, isPending, error } = useSession();
 
   if (isPending) {
     return <LoadingScreen message="Checking session…" />;
   }
 
-  const isAuthenticated = Boolean(session?.user);
+  const isAuthenticated = Boolean(session?.user) && !error;
 
   return (
     <Stack