Pin E2E simulators and fix Expo device selection

.github/scripts/run-nightly-e2e.sh

@@ -144,16 +144,27 @@ fi
 
 phase "Building and installing the development client"
 if [[ "$platform" == "ios" ]]; then
+  # Passing --device makes this Expo version merge simulator and devicectl
+  # results. On Xcode 26.4, devicectl can misclassify the simulator as a
+  # physical device and incorrectly require signing. Exactly one simulator is
+  # booted above, so Expo's default simulator-only resolver selects it.
+  echo "Building for already booted iOS simulator $device_id"
   EXPO_PUBLIC_ENV=e2e \
     NODE_ENV=test \
     RN_SRC_EXT=e2e.ts,e2e.tsx \
-    pnpm exec expo run:ios --device "$device_id" --no-bundler \
+    pnpm exec expo run:ios --no-bundler \
     2>&1 | tee "$artifact_dir/build.log"
 else
+  expo_device_name="$(adb -s "$device_id" emu avd name | sed -n '1p' | tr -d '\r')"
+  if [[ -z "$expo_device_name" ]]; then
+    echo "Could not resolve the AVD name for $device_id" >&2
+    exit 1
+  fi
+  echo "Building for Android AVD $expo_device_name ($device_id)"
   EXPO_PUBLIC_ENV=e2e \
     NODE_ENV=test \
     RN_SRC_EXT=e2e.ts,e2e.tsx \
-    pnpm exec expo run:android --device "$device_id" --no-bundler \
+    pnpm exec expo run:android --device "$expo_device_name" --no-bundler \
     2>&1 | tee "$artifact_dir/build.log"
 fi