fix(Reviewer): Prevent double auto-advance trigger when answering manually

[Ayush-Patel-56]

Purpose / Description

Fixes a race condition in the new study screen where manually answering a card while audio is playing causes the next card to auto-advance immediately.

Fixes

• Fixes [New Study Screen] Auto Advance plays audio twice and starts advancing cards immediately #20242

Approach

Temporarily disabled autoAdvance in ReviewerViewModel.onShowAnswer() during the manual transition. This prevents the "audio stopped" event from the previous card from triggering the auto-advance timer for the new card.

How Has This Been Tested?

Tested manually on an emulator with Auto Advance enabled (5s) and a deck with audio. Confirmed that answering quickly no longer causes double playback or immediate skipping.

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[ShaanNarendran]

Not a review but wanted to mention that the pr isn't following the standard template

[Ayush-Patel-56]

Thanks @ShaanNarendran for informing, I had changed it to standard template now.

[BrayanDSO]

I believe that the issue is fixed by #20055 (I couldn't reproduce it on that branch), which is a more definitive fix.

[Ayush-Patel-56]

Thanks for pointing that out! I also tested it manually and found that the issue is no longer reproducible on that branch. The mutex-based approach in #20055 properly handles the race condition.

Should I close this PR since #20055 provides a more comprehensive fix ?

[BrayanDSO]

If it gets merged, it will automatically close this PR. No action needed for now.