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

@@ -24,6 +24,13 @@ class CliveCheckerboardTableError(CliveDeveloperError):
     pass
 
 
+class InvalidContentUpdateError(CliveCheckerboardTableError):
+    _MESSAGE = "Cannot update cell with widget type. Use string only."
+
+    def __init__(self) -> None:
+        super().__init__(self._MESSAGE)
+
+
 class InvalidDynamicDefinedError(CliveCheckerboardTableError):
     _MESSAGE = """
 You are trying to create a dynamic checkerboard table without overriding one of the mandatory properties or methods.
@@ -83,12 +90,22 @@ class CliveCheckerBoardTableCell(Container):
         super().__init__(id=id_, classes=classes)
         self._content = content
 
+    @property
+    def content(self) -> str | Widget:
+        return self._content
+
     def compose(self) -> ComposeResult:
         if isinstance(self._content, Widget):
             yield self._content
         else:
             yield Static(self._content)
 
+    def update_content(self, content: str) -> None:
+        if isinstance(content, Widget):
+            raise InvalidContentUpdateError
+        self._content = content
+        self.query_one(Static).update(self._content)
+
 
 class CliveCheckerboardTableRow(CliveWidget):
     """Row with checkerboard columns."""
@@ -216,7 +233,6 @@ class CliveCheckerboardTable(CliveWidget):
             rows = self.create_dynamic_rows(content)
         else:
             rows = self.create_static_rows()
-
         self._set_evenness_styles(rows)
 
         if self._title is None:
@@ -272,15 +288,17 @@ class CliveCheckerboardTable(CliveWidget):
             raise InvalidDynamicDefinedError
         return True
 
-    def _set_evenness_styles(self, rows: Sequence[CliveCheckerboardTableRow]) -> None:
+    def _set_evenness_styles(self, rows: Sequence[CliveCheckerboardTableRow], starting_index: int = 0) -> None:
         for row_index, row in enumerate(rows):
             for cell_index, cell in enumerate(row.cells):
                 if not isinstance(cell, CliveCheckerBoardTableCell):
                     continue
 
-                is_even_row = row_index % 2 == 0
+                is_even_row = (row_index + starting_index) % 2 == 0
                 is_even_cell = cell_index % 2 == 0
 
+                cell.remove_class(EVEN_CLASS_NAME, ODD_CLASS_NAME)
+
                 if (is_even_row and is_even_cell) or (not is_even_row and not is_even_cell):
                     cell.add_class(EVEN_CLASS_NAME)
                 else: