fix: stream actions not working

Multiple sheets compete with each other and cause silent failure on ios.

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

@@ -1,3 +1,4 @@
+import { useState } from "react";
 import { Pressable, Text, View } from "react-native";
 import {
   CircleCheckBig,
@@ -33,13 +34,28 @@ export function StreamActionsSheet({
   isCreator,
   canDeleteParticle,
 }: StreamActionsSheetProps) {
+  // Hold the picked action until the sheet's Modal has fully unmounted, then
+  // dispatch. Follow-ups like rename/members open another Modal and "delete
+  // particle" shows an Alert — both are iOS Modals, and iOS will not present
+  // a second Modal while another is still on screen. Without this defer, the
+  // tap appears to do nothing and the app feels frozen behind a phantom
+  // overlay until the close animation finishes.
+  const [pending, setPending] = useState<StreamActionId | null>(null);
+
   const choose = (id: StreamActionId) => {
+    setPending(id);
     onClose();
-    onSelect(id);
+  };
+
+  const handleClosed = () => {
+    if (pending) {
+      onSelect(pending);
+      setPending(null);
+    }
   };
 
   return (
-    <BottomSheet open={open} onClose={onClose}>
+    <BottomSheet open={open} onClose={onClose} onClosed={handleClosed}>
       <View className="py-2">
         <ActionRow
           icon={