timeoutBetterRoutePrompt method
      
void
timeoutBetterRoutePrompt()
      
     
    
Handles timeout of the better route prompt.
- Triggers timeout callback
- Clears current suggestion
- Updates navigation manager with timeout response
Implementation
void timeoutBetterRoutePrompt() {
  navigationManager.uiModel
      .betterRouteResponse(sdk.BetterRouteResponse.timeout);
  _onBetterRouteTimedOut();
  _currentBetterRoutePromptInfo = null;
}