docs: add cropping tutorial (crop_coord)

Covers crop_coord on images, layered composites, colour-range behaviour
under cropping, the contrast fix via norm, and crop_coord vs
bounding_box_query. Runs on blobs. Needs spatialdata-plot>=0.4.2.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011JMbY8asahxaytthjvCKDv

Author: timtreis

_static/img/cropping.png

@@ -73,6 +73,16 @@ Draw circle elements as circles, hexagons, or squares with `shape=`, and
 render Visium spots as a hex grid with `shape="visium_hex"`.
 :::
 
+:::{grid-item-card} Cropping a plot
+:link: /notebooks/tutorials/cropping
+:link-type: doc
+:img-top: /notebooks/_static/img/cropping.png
+
+Zoom into a bounding box with `crop_coord` — every layer windowed at draw
+time, images rasterized for the window only, and how it differs from
+`bounding_box_query`.
+:::
+
 ::::
 <!-- gallery-cards-end -->
 
@@ -87,4 +97,5 @@ performance
 as_points
 scalebars
 marker_shapes
+cropping
 ```