fix(android): replace GuardedResultAsyncTask with AsyncTask for RN 0.85+

[ukarpenkov]

Summary

GuardedResultAsyncTask was removed from React Native in the New Architecture (0.76+). This PR replaces it with the standard android.os.AsyncTask to restore Android build compatibility with RN 0.85+.

Changes

• Replace GuardedResultAsyncTask<ReadableArray> with AsyncTask<Void, Void, ReadableArray>
• Remove super(reactContext.getExceptionHandler()) call
• Rename doInBackgroundGuarded() → doInBackground()
• Rename onPostExecuteGuarded() → onPostExecute()

Error fixed

error: cannot find symbol
import com.facebook.react.bridge.GuardedResultAsyncTask;
                                ^
  symbol:   class GuardedResultAsyncTask

Test plan

• Tested on RN 0.85.3 — Android build succeeds
• Document picking works correctly on emulator (API 35)

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Latest commit: e16f5b0

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