fix: exclude jniLibs and build dirs from rsync upload

Prevents stale .so files from local builds being synced to the VM
and creating duplicate android/android/ nested directories. The VM's
cargo-ndk generates fresh .so files — local ones must not interfere.

Also cleans any leftover android/android/ dirs from previous bad syncs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/build-android-cloud.sh

@@ -185,8 +185,12 @@ do_upload() {
     --exclude='dist' \
     --exclude='desktop/src-tauri/gen' \
     --exclude='android/keystore/*.jks' \
+    --exclude='android/app/src/main/jniLibs' \
+    --exclude='android/app/build' \
     -e "ssh $SSH_OPTS -i $SSH_KEY_PATH" \
     "$PROJECT_DIR/" "$REMOTE_USER@$ip:/root/wzp-build/"
+  # Clean any stale nested android/ dirs (from previous bad syncs)
+  ssh_cmd "rm -rf /root/wzp-build/android/android 2>/dev/null; true"
   echo "  Source uploaded."
 }