fix: issue #150 - add haptic feedback option

Automated fix by Tony CI v3.
Refs #150

Co-Authored-By: Claude <noreply@anthropic.com>

Shared/Models/UserDefaultsStore.swift

@@ -206,6 +206,7 @@ class UserDefaultsStore {
         case paywallStyle
         case lockScreenStyle
         case celebrationAnimation
+        case hapticFeedbackEnabled
 
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag