refactor: Centralize app flow handling and service event dispatching

[Mudit200408]

Refactors and centralizes app flow handling and service event dispatching.

[sameerasw]

🟡 Logic Flaws & Design Concerns

⚠️ Race Condition between Accessibility Events & UsageStats Polling

• In AppFlowHandler.onPackageChanged:

  val oldPackage = currentPackage
  currentPackage = packageName // <--- Mutated unconditionally on every call!
  ...
  if (isFromUsageStats == useUsageAccess) {
      checkAppLock(packageName)
      checkHighlightNightLight(packageName)
      checkAppAutomations(packageName)
      checkGestureBarAutomation(packageName)
  }

• If useUsageAccess is enabled, accessibility window state changes still call onPackageChanged(..., isFromUsageStats = false).
• This prematurely updates currentPackage without executing any of the checks. When AppDetectionService polls shortly after, oldPackage and currentPackage are already corrupted or identical, potentially missing exit/entry actions in App Automations and App Lock.

---

📋 Summary Verdict

Area	Status	Notes
Architectural Goal	⚠️ Incomplete	Centralizing app flow is a good idea, but implementation drops core features.
Shut Up & Freeze Features	❌ Broken	Core restoration and countdown logic was completely deleted.
Lifecycle Safety	❌ Broken	destroy() leaves a zombie singleton instance.
Gradle / Build Files	❌ Unwanted	Adds a binary .jar and modifies gradlew.

[sameerasw]

🔴 Issue 1: Complete Deletion of "Shut Up" & "App Freeze on Exit" Logic (Severe Regression)

• What happened: Over 500 lines of critical background logic were deleted from AppFlowHandler.kt without being moved anywhere:
  • Shut Up Settings Restoration: restoreShutUpSettings(), checkShutUpRestore(), and Shizuku auto-restarting logic were completely stripped.
  • Restore Notification & Promoted Ongoing Notification: The ongoing restore notification (NOTIFICATION_ID_SHUTUP_RESTORE), ACTION_RESTORE_NOW, and interactive restore actions were deleted.
  • Freeze on Exit / Auto-Archive Countdowns: activeCountdowns, ACTION_FREEZE_NOW, and ACTION_ABORT_FREEZE broadcast receivers and notifications were removed.
• Impact: Merging this will completely break the Shut Up feature and App Freeze-on-Exit automations, preventing system settings from ever being restored and frozen apps from being managed on app exit.

[sameerasw]

🔴 Issue 2: Singleton Lifecycle & Premature Listener Teardown (State Corruption)

• Location: AppDetectionService.kt:147–151 & AppFlowHandler.kt:84–95
• What happened:
  • AppFlowHandler is now a static singleton INSTANCE.
  • When AppDetectionService.onDestroy() runs, it calls appFlowHandler.destroy(), which unregisters SharedPreferences listeners, ComponentCallbacks, and the MEDIA_PLAYBACK_CHANGED broadcast receiver from the application context.
  • However, INSTANCE is never reset to null.
• Impact: If AppDetectionService restarts or ScreenOffAccessibilityService continues using AppFlowHandler, the handler is left in a dead/unregistered state where preference changes and media events are permanently ignored until a full process kill.

[sameerasw]

🔴 Issue 3: Unrelated / Suspicious Gradle Binary & Wrapper Script Changes

• Files Modified:
  • gradle/wrapper/gradle-wrapper.jar (Binary added: +53 KB)
  • gradlew (Modified invocation from -jar to -classpath)
• Impact: Changes to binary wrapper jars or gradlew execution in a feature PR are a security concern, unnecessary, and out-of-scope.