On an unfolded iPhone Duo, the Git, Files and Changed files inspectors
stopped 84pt short of the vertical bar. The Git list sat in a third of
the column with its title cut off, and the Files header had no room for
its search button.

Each pane hosts its own native stack inside the inspector column, which
already insets its body for the vertical bar. UIKit still gives a nested
navigation controller's screens the bar's inset wherever they sit, so
the pane headers and the Git list took it a second time.

The inspector column now leaves horizontal insets to its panes. Their
native stacks reach the column edge, where UIKit's inset is right, and
NativeInspectorContent pads each pane's content once with the column's
insets. It replaces NativeSheetContent, whose own provider re-read the
nested screen's inset.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>