Fix mobile account session selection

app/(auth)/index.tsx

@@ -1,5 +1,12 @@
 import { Redirect } from "expo-router";
+import { useAccounts } from "@/contexts/AccountsContext";
 
 export default function AuthIndex() {
+  const { accounts, activeAccountId } = useAccounts();
+
+  if (!activeAccountId && accounts.length > 0) {
+    return <Redirect href="/(auth)/select-account" />;
+  }
+
   return <Redirect href="/(auth)/sign-in" />;
 }