HarmonyOS Vibration: When System Settings Override Module Rules

This issue highlights a critical inconsistency between HarmonyOS and Android vibration handling that developers must understand. When system-level vibration settings are disabled in HarmonyOS, vibration APIs become ineffective regardless of app-level configuration—a behavior that differs from Android and requires developers to implement fallback strategies. Understanding the tri-state switch (Ring/Vibrate/Silent) and haptic feedback switch hierarchy is essential for creating consistent cross-platform user experiences and managing notification behavior effectively.