feat: implement pocket mode exclusions and active app checks

[Mudit200408]

No description provided.

[sameerasw]

Hi! Can you take a look at these concerns and verify?

Potential Issues & Suggestions

1. IPC / Main Thread Blocking in isAppBypassedForPocketMode()

• Location: ScreenOffAccessibilityService.kt
• Issue: isAppBypassedForPocketMode() is called directly inside onSensorChanged() on every single proximity and light sensor event.
• Detail: Inside isAppBypassedForPocketMode(), it opens SharedPreferences (getSharedPreferences(...)), checks UsageStatsManager.queryEvents(), calls rootInActiveWindow (Accessibility IPC), checks active media sessions via MediaSessionManager, and queries PackageManager.
• Risk: Proximity/Light sensors can fire dozens of times per second. Executing multiple IPC calls, SharedPreferences reads, and accessibility window tree queries directly on the main thread inside onSensorChanged() will cause UI stutters, frame drops, or high CPU usage.
• Recommendation: Cache isBypassed status or run app bypass checks only when sensor state transitions from unblocked to blocked, rather than on every raw sensor event update.

2. SharedPreferences Instantiation Overhead

• Location: ScreenOffAccessibilityService.kt lines 397 & 431
• Issue: getSharedPreferences("essentials_prefs", MODE_PRIVATE) is called repeatedly inside isAppBypassedForPocketMode(), getActivePackageName(), and onSensorChanged().
• Recommendation: ScreenOffAccessibilityService already maintains shared preference state or listeners. Accessing prefs repeatedly inside high-frequency sensor callbacks should be replaced with cached properties or a single SharedPreferences reference.

3. hasActiveMediaSession() Context / Exception Edge Case

• Location: ScreenOffAccessibilityService.kt
• Issue: Checking active media sessions on certain OEM ROMs or restricted user profiles can throw SecurityException if notification access / media listener permission is revoked or restricted.
• Recommendation: Wrap calls to hasActiveMediaSession() inside a try-catch block inside isAppBypassedForPocketMode() to prevent unexpected service crashes.