Cart Screen

Renders the local cart: list of LocalCartItem rows with qty steppers, a per-row checkbox driven by CartSelectionController, a running total of selected items, and a 'Checkout' button that hands off to CheckoutScreen.

1. Watches cartControllerProvider and cartSelectionProvider for state.
2. Empty state renders a centered illustration with a 'Continue shopping' CTA.
3. Qty stepper calls CartController.updateQuantity; tap-to-remove calls removeItem.
4. Promo code input is local-only here — the actual /store/carts/:id/promotions call happens after the backend cart is created in checkout.
5. Tapping Checkout pushes the CheckoutScreen, passing only the selected variant IDs (not the full local list).

• PaymentModesData inline list (cash/Paytm/online) is a UI placeholder — the real payment provider list is fetched in CheckoutScreen via fetchPaymentProviders.
• Screen implements TopBarClickListener for the shared top-bar callbacks — back, search, notification icons.
• Hot-reload while the cart is empty re-runs fillData and resets paymentModeList — safe because the list is not user-mutated.

• lib/src/features/shared/cart/views/cart_screen.dart:18 // CartScreen
• lib/src/features/shared/cart/views/cart_screen.dart:60 // ref.watch(cartControllerProvider)

The S.current.cashOnDeliveryLabel-style placeholder rows in fillData are remnants from a previous design where this screen also picked payment methods — keep until the new checkout is fully launched.