Add new functionality for image rectification and depth metadata handling

- Implemented a preview tool for rectifying images with interactive aspect controls in `preview.py`.
- Added tests for depth metadata loading to ensure consistent schema usage in `test_depth_metadata.py`.
- Developed comprehensive tests for cutout calibration processes in `test_cutout_calibration.py`, including stability checks and depth calibration.
- Created tests for frame compositing operations in `test_frame_compositing.py`, ensuring correct handling of depth and transparency.
- Introduced material slot inheritance functionality in `material_slots.py` to manage geometry material assignments.
- Built shared shader nodes for material processing in `shader.py`, including roughness and bump mapping setups.

src/anyimage/panel.py

@@ -87,15 +87,15 @@ class ServerPanel(bpy.types.Panel):
             cached_row = layout.row(align=True)
             if len(cached_names) > 1:
                 cached_list = cached_row.column(align=True)
-                cached_list.label(text="Cached:")
+                cached_list.label(text="Loaded Models:")
                 for name in cached_names:
                     cached_list.label(text=name)
             else:
                 cached_row.label(
                     text=(
-                        f"Cached: {cached_names[0]}"
+                        f"Loaded Models: {cached_names[0]}"
                         if cached_names
-                        else "Cached: None"
+                        else "No Models Loaded"
                     )
                 )
             clear = cached_row.row(align=True)