### What?
Enables the indent/outdent button if at least one selected node can be
indented/outdented.
### Why?
Before, the buttons were disabled e.g. if multiple nodes were selected
of which one was not indentable/outdentable or if a child node was not
indentable but the parent was, leading to inconsistent behavior.
### How?
Checks if the node itself or any parent fulfills the criteria. The
change affects only the buttons active state, not the actual indentation
logic.
Fixes https://github.com/payloadcms/payload/pull/12042
9b1dd2a8d8