refactor: remove dead export_gltf.py, cleanup rendering tasks, improve tessellation UI

- Remove export_gltf.py (Blender-based GLB export replaced by OCC direct)
- Remove unused export_gltf_for_order_line_task
- Add Ultra tessellation preset to Admin settings
- Improve tessellation preset descriptions and styling
- Minor cleanup across media, rendering, and workflow modules

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -73,7 +73,6 @@ schaefflerautomat/
 │   │   ├── blender_render.py     # Entry point (68 lines), delegates to _blender_*.py submodules
 │   │   ├── export_step_to_gltf.py  # OCC/GMSH STEP → GLB tessellation
 │   │   ├── export_step_to_usd.py   # OCC STEP → USD canonical scene
-│   │   ├── export_gltf.py        # Blender: materials, seams, sharp edges on GLB
 │   │   ├── import_usd.py         # Blender: USD import + primvar restoration
 │   │   ├── still_render.py       # Blender still render
 │   │   └── turntable_render.py   # Blender turntable animation