✨ Simplify event preservation conditions and enhance UI elements

Refactor event preservation checks in the dashboard and index views to remove unnecessary conditions. Update the styling of the preservation indicators for better visual appeal and consistency. Adjust header dropdown shadow for improved aesthetics. :sparkles: Enhance event preservation flow and UI Add return URL handling for event preservation to improve user experience during payment processes. Update event preservation descriptions and button labels for clarity. Refactor the event preservation view to enhance layout and responsiveness, including dynamic content updates via Turbo Streams. Introduce a refund policy section in the pricing page to boost user confidence. Adjust various UI elements for better visual consistency across event-related views.