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.

tools/nodes/groups/image_layer.py

@@ -1,7 +1,7 @@
 """Build O Image Layer."""
 import bpy
 from anyimage.common.material import IMAGE_MATERIAL_NODE_GROUP_NAME
-from ..common.materials import build_material_nodes, connect_material_outputs
+from ..common.shader import build_material_nodes, connect_material_outputs
 
 
 def build_image_layer_group():
@@ -26,17 +26,22 @@ def build_image_layer_group():
             socket.max_value = 1.0
             socket.subtype = 'FACTOR'
         elif name == 'Bump Scale':
+            socket.description = 'Control bump detail derived from image brightness. Negative values reverse the bumps. Zero disables the effect.'
             socket.default_value = 0.0
             socket.min_value = -10000.0
             socket.max_value = 10000.0
         elif name == 'Normal':
             socket.default_value = (0.5, 0.5, 1.0, 1.0)
         elif name == 'Normal Scale':
+            socket.description = 'Control the strength of surface detail from the normal map.'
             socket.default_value = 1.0
             socket.min_value = 0.0
             socket.max_value = 10.0
         elif name == 'Object Space':
+            socket.description = 'Interpret the normal map in object space when enabled, or tangent space when disabled.'
             socket.default_value = False
+        if name == 'Alpha Fix':
+            socket.description = 'Reduce semi-transparent fringes around image edges. Higher values remove more faint edge pixels. Zero keeps the original transparency.'
     output_sockets = [('Color', 'NodeSocketColor'), ('Roughness', 'NodeSocketFloat'), ('Alpha', 'NodeSocketFloat'), ('Normal', 'NodeSocketVector')]
     for name, socket_type in output_sockets:
         interface.new_socket(name=name, in_out='OUTPUT', socket_type=socket_type)