Release SpatialViewer v0.4.2 with CAD compatibility report

[KiYouJyo]

Goal

Release SpatialViewer v0.4.2 with the already-prepared CAD compatibility report exporter integrated into the current v0.4.1 UI baseline.

UI integration

• adds Export CAD compatibility report at the bottom of the existing CAD Properties pane
• preserves CAD toolbar geometry, inline sidebars, canvas, title bar, tabs and responsive behavior
• reuses the existing InfoBar for unavailable/success/failure feedback
• zh-CN / ja-JP / en-US localization

Report

• privacy-safe JSON from the loaded reader-independent CadDocument
• app/CadCore/adapter product versions
• allow-listed aggregate reader metadata
• structural custom-object grouping
• proxy primitive translated/unsupported totals
• raw proxy command structural signatures, unknown type IDs and malformed/truncated aggregates when supplied by CadCore v0.12.10
• saves under Desktop/SpatialViewer Diagnostics with LocalAppData fallback
• copies the exported path to the clipboard

Privacy boundary

No drawing filename/path, entity/target handles, layer names, coordinates, raw property values, colors, text, raw DWG/DXF bytes or complete entity metadata are serialized.

Release identity

• product: 0.4.2
• MSIX: 0.4.2.0
• release pipeline: resolve and embed latest stable compatible CadCore through SpatialViewer.CadHost

This branch is based on the current v0.4.1 main so the Rhino rendering/responsiveness hotfix remains intact.