a5378da020
Extend the export manager to support STL and OBJ formats in addition to the existing GLB export. Uses Three.js built-in STLExporter and OBJExporter - no new dependencies. STL is the standard format for 3D printing. OBJ is widely used in rendering pipelines and supports basic materials. Both are requested in the community discussion on #145. Changes: - export-manager.tsx: add STLExporter and OBJExporter, accept format param - settings-panel: three format-specific export buttons (GLB, STL, OBJ) - use-viewer store: update exportScene type to accept optional format The format parameter defaults to 'glb', so existing callers (command palette) continue to work without changes. Relates to #145 Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>