Export QQuick3DItem2D from the private API


The class was only exported for autotests, so tooling that needs to
find Item2D wrappers in a scene and reach their content item linked
against a developer build of Qt but failed to link against a regular
one.

Change-Id: I0759a3a35639316ee8b25a180adc84650cdb59df
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
commitc1732e218f32aa2bf180a274826bbf0d1de485f2
parent6c9c72259d0a6aa9f009e3e98f6fb629ee977e4d
authorAndy Nichols <andy.nichols@qt.io>
committerAndy Nichols <andy.nichols@qt.io>
commit timeThu, 15 Oct 2026 10:30:55 +0000