fix(rhino): SpatialViewer 0.4.1 rendering and responsiveness hotfix

[KiYouJyo]

Field issue

• valid 3DM files loaded layers/object counts but showed a blank viewport
• the app could become unresponsive shortly after load

Fixes

• pin SpatialViewer.3DMCore 1.0.2 with Brep/Extrusion fallback tessellation when Rhino render meshes are absent
• move prepared render-scene construction off the WinUI UI thread
• replace per-triangle Win2D CanvasGeometry creation with batched per-instance paths
• add bounded fill/wire/curve/point frame budgets
• add dark/light canvas contrast correction for Rhino colors
• bound selection highlighting for complex meshes
• keep wheel zoom available across Select/Orbit/Pan tools

Safety

• no CAD viewer, CAD viewport, CadCore, title bar, tabs, navigation, Projects, Favorites, or theme code changed
• Rhino/CAD viewer parity contract remains green

Validation

• 3DMCore 1.0.2 main CI: PASS
• trilingual localization: PASS
• app update/version contract: PASS
• Debug: PASS
• Release: PASS
• full tests: PASS