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/widgets/clive_checkerboard_table.py

@@ -196,10 +196,34 @@ class CliveCheckerboardTable(CliveWidget):
         self.update_previous_state(content)
         await self.rebuild(content)
 
+    async def _rebuild_header(self) -> None:
+        await self.query("*")[1].remove()
+        await self.mount(self._header, after=self._title)
+
+    async def _rebuild_rows(
+        self,
+        row_type: Any,  # noqa: ANN401
+        start_index: int = 0,
+        end_index: int | None = None,
+    ) -> None:
+        rows = self.query(row_type)
+        assert start_index < len(
+            rows
+        ), "Starting_from_element parameter has higher value than number of elements in the table"
+        if end_index:
+            assert (
+                start_index < end_index
+            ), "Starting_from_element parameter has higher value than ending_with_element argument"
+
+        for index in range(start_index, end_index + 1 if end_index else len(rows)):
+            await rows[index].remove()
+        self._mount_static_rows(start_index, end_index)
+
     async def rebuild(
         self,
         content: Content | None = None,
         row_type: Any = None,  # noqa: ANN401
+        rebuild_header: bool = False,
         starting_from_element: int = 0,
         ending_with_element: int | None = None,
     ) -> None:
@@ -213,31 +237,13 @@ class CliveCheckerboardTable(CliveWidget):
         if not self.should_be_dynamic and content is not None:  # content is given, but table is static
             raise RebuildStaticTableWithContentError
         with self.app.batch_update():
-            if starting_from_element == 0 and ending_with_element is None:
-                await self.query("*").remove()
-                await self.mount_all(self._create_table_content(content))
+            if rebuild_header:
+                await self._rebuild_header()
+            if self.should_be_dynamic:
+                self._create_table_content(content)
             else:
-                rows = self.query(row_type)
                 assert row_type, "You have to set row_type."
-                assert starting_from_element < len(
-                    rows
-                ), "Starting_from_element parameter has higher value than number of elements in the table"
-                if ending_with_element:
-                    assert (
-                        starting_from_element < ending_with_element
-                    ), "Starting_from_element parameter has higher value than ending_with_element argument"
-                # remove elements
-                for index in range(
-                    starting_from_element, ending_with_element + 1 if ending_with_element else len(rows)
-                ):
-                    await rows[index].remove()
-
-                # mount again - rebuild only rows after index
-                (
-                    self._mount_static_rows(starting_from_element, ending_with_element)
-                    if not self.should_be_dynamic
-                    else self._create_table_content(content)
-                )
+                await self._rebuild_rows(row_type, starting_from_element, ending_with_element)
 
     def _create_table_content(
         self, content: Content | None = None, rows_from_index: int = 0, rows_to_index: int | None = None