Coordinate video and voice playback resources

[mubarakcoded]

Summary

• give both Media3 video players audio-focus handling and pause active voice notes before playback
• preserve voice playback across transient focus loss and duck on duckable interruptions
• prepare pager videos only while current and stop off-screen players to release decoders
• add regression coverage for audio-focus and decoder ownership policies

Verification

• git diff --check
• Local Gradle tests intentionally not run for this fast sweep; CI will validate the branch.

Closes #1501
Closes #1502

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0dc76cc3-64bc-4256-8360-153dd1c0e85b

📥 Commits

Reviewing files that changed from the base of the PR and between 0d960ce and 64e5d23.

📒 Files selected for processing (5)

• app/src/main/java/dev/ipf/whitenoise/android/audio/VoicePlaybackController.kt
• app/src/main/java/dev/ipf/whitenoise/android/ui/conversation/media/MediaVideo.kt
• app/src/test/java/dev/ipf/whitenoise/android/audio/VoicePlaybackAudioFocusPolicyCoverageTest.kt
• app/src/test/java/dev/ipf/whitenoise/android/audio/VoicePlaybackControllerFocusTest.kt
• app/src/test/java/dev/ipf/whitenoise/android/ui/VideoPlaybackCoordinationCoverageTest.kt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sweep/1501-1502-media-playback

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[stage-review]

Ready to review this PR? Stage has broken it down into 3 individual chapters for you:

	Title
1	Enhance voice playback audio focus handling
2	Coordinate video players with voice playback
3	Verify audio focus and coordination policies

_{Chapters generated by Stage for commit 64e5d23 on Jul 17, 2026 12:01pm UTC.}

[github-actions]

Preview APK for PR #1507

Home-screen label: 1507 White Noise with the blueprint launcher icon — installs side-by-side with the production and staging apps.

Install directly — one tap, no GitHub sign-in (public, content-addressed .apk). ARM64 only.

Every push to this PR rebuilds and updates this comment.