fix android e2e flow failures: matchers, timing, media seeding, gestures

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -153,6 +153,16 @@ if [[ "$platform" == "android" ]]; then
   phase "Configuring Android localhost routing"
   adb -s "$device_id" reverse tcp:3000 tcp:3000
   adb -s "$device_id" reverse tcp:8081 tcp:8081
+
+  # The e2e media picker mock reads a seeded photo from the app's external
+  # files directory (see src/lib/media/picker.e2e.tsx). The app must already
+  # be installed (the install step runs before this script), so the directory
+  # exists and is owned by the app; sdcardfs makes it world-readable so the
+  # mock can read the file without any runtime media permission.
+  phase "Seeding e2e media"
+  e2e_media_dir="/sdcard/Android/data/xyz.blueskyweb.app/files/e2e"
+  adb -s "$device_id" shell mkdir -p "$e2e_media_dir"
+  adb -s "$device_id" push assets/images/welcome-modal-bg.jpg "$e2e_media_dir/test.jpg"
 fi
 
 phase "Running Maestro flows"