Add Scalebar preview (#976)#1459
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Summary
This PR adds a
#PreviewtoScalebar.swiftto allow quick visual validation of changes without needing to build and run the full app, addressing issue #976 .What changed
#Previewblock toScalebar.swiftspatialReference,unitsPerPoint,viewpoint) via.onAppearPickerto interactively switch between all fiveScalebarStylecasesWhy this change
Scalebarhas no internal state, so map inputs must be seeded manually in the preview