Stabilize mobile auth session handling

app/_layout.tsx

@@ -16,6 +16,7 @@ import { View } from "react-native";
 import { StatusBar } from "expo-status-bar";
 import "react-native-reanimated";
 import { SafeAreaProvider } from "react-native-safe-area-context";
+import { GestureHandlerRootView } from "react-native-gesture-handler";
 
 import { BrandBackground } from "@/components/BrandBackground";
 import { LoadingScreen } from "@/components/LoadingScreen";
@@ -84,28 +85,30 @@ export default function RootLayout() {
   }
 
   return (
-    <SafeAreaProvider>
-      <ThemeProvider>
-        <ThemedChrome>
-          <AccountsProvider>
-            <AppServices>
-              <RootNavigator />
-            </AppServices>
-          </AccountsProvider>
-        </ThemedChrome>
-      </ThemeProvider>
-    </SafeAreaProvider>
+    <GestureHandlerRootView style={{ flex: 1 }}>
+      <SafeAreaProvider>
+        <ThemeProvider>
+          <ThemedChrome>
+            <AccountsProvider>
+              <AppServices>
+                <RootNavigator />
+              </AppServices>
+            </AccountsProvider>
+          </ThemedChrome>
+        </ThemeProvider>
+      </SafeAreaProvider>
+    </GestureHandlerRootView>
   );
 }
 
 function RootNavigator() {
-  const { data: session, isPending, error } = useSession();
+  const { data: session, isPending } = useSession();
 
   if (isPending) {
     return <LoadingScreen message="Checking session…" />;
   }
 
-  const isAuthenticated = Boolean(session?.user) && !error;
+  const isAuthenticated = Boolean(session?.user);
 
   return (
     <Stack