fix: media scan on download for Android 11+

[mykh-hailo]

Summary

Ensures downloaded files are scanned and indexed so they appear in the device’s media library (e.g. Photos/Gallery) on Android 11 (API 30) and above.

Closes: #16101

Problem

In triggerMediaScan(), Android 11+ was handled by only logging "SDK > 29, skipping media scan" and not performing any scan. As a result, files downloaded via the Nextcloud app were not added to the MediaStore and did not show up in system media apps.

Solution

Use MediaScannerConnection.scanFile() for devices with SDK ≥ 30 instead of skipping the scan. This API:

Works correctly on Android 10+
Takes the file path and optional MIME type
Uses a callback for success and failure
Logs scan completion or failure for debugging

Changes

• FileDataStorageManager.java

  • Added MediaScannerConnection import
  • Replaced the “skip” logic on Android 11+ with MediaScannerConnection.scanFile()
  • Passes the file’s MIME type when OCFile is available
  • Adds callback logging for scan success and failure

This PR was generated by Mykhailo. View the repository job log.

[mykh-hailo]

@alperozturk96 I am happy for my first contribution on nextcloud-android.
I'd appreciate it if you check and leave some comments on it.