Current topic: "Updating Imports and State"
Topic summary: I am updating the imports and state management in `VehicleListScreen.kt`. I'm replacing `UpgradeDialog` with `PaywallInfoSheet` and `PaywallStatusCard`. I'm also adding a `showPaywallSheet` state variable and a `LaunchedEffect` to collect the `showPaywallSheet` signal from the ViewModel. This ensures the UI is ready to show the new paywall components when triggered.

Strategic Intent: Updating imports and state in VehicleListScreen.