Previous commit (0b72827) accidentally swept the local
android/.gradle, android/build, android/app/build, and
android/local.properties into the index via `git add android/`.
Root .gitignore only had entries for flutter_client/android/
paths, not the new native android/ tree.
Removes the cached files via `git rm --cached` and extends
.gitignore to cover the native Android Studio output dirs
(.gradle, .kotlin, .idea, build, app/build, local.properties,
*.iml). Source code is unaffected — only build-output and IDE
artifacts get untracked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
2851f8c694