Support 2D / Columbus View in snapping APIs

[markschlosseratbentley]

Feature

Client-side and server-side snapping APIs assume a 3D view (SceneMode.SCENE3d).

2D or Columbus Views have not been tested.

This issue is filed as a followup to #13682 review discussion.

What I suggest as a first step:

Test both snapping APIs (server-side and client-side) and note actual behavior before building any solution.

AI acknowledgment

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