Refactor Cart into checkerboard table

Closes: #173 (closed)

Removes clear all feature from: #233

This one improves focus behavior in the cart, moving cart items and deleting items from the cart.

clive/__private/ui/operations/cart.py

@@ -214,7 +214,7 @@ class CartTable(CliveCheckerboardTable):
     @staticmethod
     def _create_widget_id_to_focus(event: CartItem.Focus | CartItem.Move) -> str:
         assert event.button_to_focus is not None, "Button to focus has to be passed to get it's id."
-        return event.button_to_focus
+        return f"#{event.button_to_focus}"
 
     def _disable_appropriate_button(self, widget: CartItem) -> None:
         if len(self.app.world.profile.cart) > 0 and widget.reactive_idx == 0:
@@ -247,13 +247,17 @@ class CartTable(CliveCheckerboardTable):
 
         for cells, data in [(to_cells, from_data), (from_cells, to_data)]:
             for cell, value in zip(cells, data):
-                cell.update_content(value)  # type: ignore[arg-type]
+                assert isinstance(value, str), "New value for cell has to be a string."
+                cell.update_content(value)
+
+    async def _remove_operation_from_everywhere(self, widget: CartItem) -> None:
+        self._rows.remove(widget)
+        await widget.remove()
+        self.profile.cart.remove(widget.operation)
 
     @on(CartItem.Delete)
     async def remove_item(self, event: CartItem.Delete) -> None:
-        self._rows.remove(event.widget)
-        await event.widget.remove()
-        self.profile.cart.remove(event.widget.operation)
+        await self._remove_operation_from_everywhere(event.widget)
         self._handle_remove_event(triggering_widget=event.widget)
         self.app.trigger_profile_watchers()
         self._disable_appropriate_button(event.widget)
@@ -272,7 +276,7 @@ class CartTable(CliveCheckerboardTable):
                 self.app.set_focus(cart_item)
                 if event.button_to_focus:
                     button_id = self._create_widget_id_to_focus(event)
-                    cart_item.query_one(f"#{button_id}").focus()
+                    cart_item.query_one(button_id).focus()
 
     @on(CartItem.Focus)
     def focus_item(self, event: CartItem.Focus) -> None:
@@ -281,7 +285,7 @@ class CartTable(CliveCheckerboardTable):
                 self.app.set_focus(cart_item)
                 if event.button_to_focus:
                     button_id = self._create_widget_id_to_focus(event)
-                    cart_item.query_one(f"#{button_id}").focus()
+                    cart_item.query_one(button_id).focus()
 
 
 class Cart(BaseScreen):