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>

render-worker/scripts/export_step_to_gltf.py

@@ -468,8 +468,17 @@ def _collect_part_key_map(shape_tool, free_labels) -> dict:
         if label.FindAttribute(TDataStd_Name.GetID_s(), name_attr):
             name = name_attr.Get().ToExtString()
 
+        # Dereference component references to their definition label
+        # (the definition may itself be an assembly with sub-components)
+        from OCP.TDF import TDF_Label as _TDF_Label
+        actual_label = label
+        if XCAFDoc_ShapeTool.IsReference_s(label):
+            ref_label = _TDF_Label()
+            if XCAFDoc_ShapeTool.GetReferredShape_s(label, ref_label):
+                actual_label = ref_label
+
         components = TDF_LabelSequence()
-        XCAFDoc_ShapeTool.GetComponents_s(label, components)
+        XCAFDoc_ShapeTool.GetComponents_s(actual_label, components)
 
         xcaf_path = f"{path}/{name}" if name else f"{path}/unnamed"