Adds a ⚙ icon button to the right of the AA toggle in each viewport
tile's compact toolbar. Clicking it opens a dropdown with:
- Shading submenu: Smooth Shaded / Flat Shaded / Wireframe on Surface /
Wireframe / Unlit (new ShadingMode enum driving UsdImagingGLDrawMode)
- Lighting submenu: Camera Headlight / Scene Lights + Dome Light toggle
- Show Grid and Anti-Aliasing toggles (mirrored from icon buttons)
- Bounding Box submenu: None / Per Object / All Selection
- Background submenu: Dark Gray / Black / Light Gray / Midnight Blue
ShadingMode is persisted in viewport_settings.ini alongside the existing
per-tile settings (saved on shutdown, restored on startup).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
indigo
8316e419ba