State Management Updates

What changed: Added feedbackSurvey object to app-level state structure

New state fields:

feedbackSurvey: {
  timeLastShown: null,
  submitCountAtLastAppearance: null
}

Details:

• Persists survey appearance timing and submission count
• Enables accurate rate limiting across sessions
• Synced to global settings via state change handler
• Evidence: State structure at line 298044, sync handler in Wb() (renamed from Bb) at line 482021