SliverGridDelegateWithMaxCrossAxisExtent
SliverGridDelegate is an abstract class in Flutter that describes how a grid of children should be laid out inside a sliver. It participates in the layout of grid-based slivers, such as SliverGrid, and works with a SliverChildDelegate to place and build children. A delegate receives the constraints of the scrollable area and reports a SliverGridLayout that determines the position and size of each child. The layout strategy is provided by concrete implementations and can adapt to changes in screen size, orientation, or other layout constraints.
Two common concrete implementations provide typical patterns for grid layouts. SliverGridDelegateWithFixedCrossAxisCount fixes the number of columns
The grid delegate can signal when a relayout is needed, via shouldRelayout, enabling efficient updates when
Usage typically involves passing a gridDelegate to a SliverGrid inside a CustomScrollView or other sliver-containing scroll