fix(badge): create Android badge notification channel

[ericyewang]

Pull request checklist

• The changes have been tested successfully.
• A changeset has been created (npm run changeset).
• I have read and followed the pull request guidelines.

What changed

• Create a badge-enabled notification channel on Android 8+ before ShortcutBadger runs its support check or applies a count.
• Reuse the same apply path for set and persisted-count restore so Badge.set({ count }) can prepare badge support before any app notification is posted.

Closes #3.

Testing

• git diff --check
• JAVA_HOME=/Applications/StataNow/utilities/java/macos-arm64/zulu-jdk21.0.7/zulu-21.jdk/Contents/Home ./gradlew test (blocked by TLS handshake failures while resolving Gradle dependencies from dl.google.com and Maven Central in this environment)

[robingenz]

I’ve just tested it, and unfortunately it doesn’t work as expected. Creating a badge via a notification channel would also require an active notification, which is out of scope for this plugin.