fix(mobile): exiting from huddle

js/mobile/src/features/stream-view/StreamView.tsx

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useState } from "react";
 import { Alert, Dimensions, Pressable, Text, View } from "react-native";
+import { useIsFocused } from "@react-navigation/native";
 import { SafeAreaView, useSafeAreaInsets } from "react-native-safe-area-context";
 import { StatusBar } from "expo-status-bar";
 import * as Haptics from "expo-haptics";
@@ -385,7 +386,11 @@ function StreamViewInner({ streamParticle, path, onExit }: StreamViewProps) {
   });
 
   // --- End-of-stream countdown ---
-  const exitRemainingMs = useExitCountdown(status, paused, exit);
+  // Pause the countdown when this screen isn't focused (e.g. a Huddle screen
+  // is mounted on top). Otherwise the timer keeps ticking under the huddle
+  // and goBack() pops the huddle out from under the user.
+  const isFocused = useIsFocused();
+  const exitRemainingMs = useExitCountdown(status, paused || !isFocused, exit);
 
   // Chrome reservations: top = safe-area + segmented bar (3) + gap (12) +
   // metadata row (~38) + breathing room (12). Bottom = safe-area + compose