fix(android): emit ARM64-only Pixel 10 APK

PIXEL_10.md

@@ -32,7 +32,8 @@ the generated assets and native runtime, then run:
 melos run build-browser-pixel10 --no-select
 ```
 
-The command produces:
+The command asks Flutter for a split ARM64 artifact, verifies that no other
+ABI is packaged, and publishes it under the stable path:
 
 ```text
 apps/weblibre/build/app/outputs/flutter-apk/app-pixel10-release.apk

pubspec.yaml

@@ -111,5 +111,8 @@ melos:
       run: |
         set -e
         cd apps/weblibre
-        flutter build apk --release --flavor pixel10 --target-platform android-arm64 --no-tree-shake-icons
+        flutter build apk --release --flavor pixel10 --target-platform android-arm64 --split-per-abi --no-tree-shake-icons
+        arm64_apk="$(find build/app/outputs/flutter-apk -maxdepth 1 -type f -name '*pixel10*' -name '*arm64-v8a*' -name '*release.apk' -print -quit)"
+        test -n "$arm64_apk"
+        mv "$arm64_apk" build/app/outputs/flutter-apk/app-pixel10-release.apk
         ../../scripts/verify-pixel10-apk.sh build/app/outputs/flutter-apk/app-pixel10-release.apk