Make chat notification state atomic

[mubarakcoded]

Summary

• replace parallel mute flows with one immutable notification state and derived muted-key projection
• serialize state publication and preference persistence to prevent lost concurrent updates
• compare notification tap capability tokens with MessageDigest.isEqual
• update consumers and add regression coverage for both invariants

Verification

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

Closes #1500
Closes #1505

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[stage-review]

Ready to review this PR? Stage has broken it down into 4 individual chapters for you:

	Title
1	Secure notification tap token validation
2	Unify chat notification state and serialization
3	Update UI consumers for atomic state
4	Verify atomic state and concurrency

_{Chapters generated by Stage for commit 6dbdc6e on Jul 17, 2026 12:02pm UTC.}

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b9f25f51-f26e-49dd-86b4-514e2d3659b0

📥 Commits

Reviewing files that changed from the base of the PR and between 13c6751 and 6dbdc6e.

📒 Files selected for processing (6)

• app/src/main/java/dev/ipf/whitenoise/android/notifications/NotificationTapTokens.kt
• app/src/main/java/dev/ipf/whitenoise/android/state/ChatMutePreferences.kt
• app/src/main/java/dev/ipf/whitenoise/android/ui/chats/ChatsScreen.kt
• app/src/main/java/dev/ipf/whitenoise/android/ui/group/GroupDetailsScreen.kt
• app/src/test/java/dev/ipf/whitenoise/android/notifications/NotificationTapTokensTest.kt
• app/src/test/java/dev/ipf/whitenoise/android/state/ChatMutePreferencesTest.kt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sweep/1500-1505-state-security

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[github-actions]

Preview APK for PR #1508

Home-screen label: 1508 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.