Add tests for foreground preservation and refactor geometry node asset

- Implement test to ensure foreground preserves source RGB and Ben2 alpha in WorkerTest.
- Remove outdated tests related to background distance and original background depth.
- Update geometry node asset to reflect new naming conventions and structure.
- Introduce validation for depth plane asset, ensuring correct input/output configurations and attribute handling.
- Adjust confidence and edge parameters in geometry node asset to support a wider range of values.

src/snapform/properties.py

@@ -67,7 +67,7 @@ class SnapFormSettings(bpy.types.PropertyGroup):
     )
     conf_thresh_percentile: bpy.props.FloatProperty(
         name="Confidence Threshold",
-        description="Remove the lowest-confidence percentile of points or mesh faces",
+        description="Remove the lowest-confidence percentile of points or surface faces",
         default=40.0,
         min=0.0,
         max=100.0,
@@ -135,8 +135,8 @@ class SnapFormSettings(bpy.types.PropertyGroup):
             ),
             (
                 "mesh",
-                "Textured Mesh (GLB)",
-                "Generate one filtered textured depth mesh per input image",
+                "Textured Surface (GLB)",
+                "Generate one filtered textured depth surface per input image",
             ),
         ),
         default="glb",