[nicboone8]

Companion frontend PR: KittyCAD/modeling-app#15135. Publish with that change.

• Describe body icons, expandable histories, shared features and selection/visibility in one tree.
• Keep 3D patterns and their copies under the source body, without separate copy body rows. Explain source-body controls and Scene selection of individual copies.
• Update workspace, Delete and dialog instructions while retaining existing URLs.
• Remove screenshots of the superseded split layout; replacement screenshots await live visual review.

The documentation build generates all 640 documents successfully.