Refactor image mesh processing and background removal functionality

- Updated NODE_GROUP_NAME from "O Refine DA3 Surface" to "O DA3 Surface".
- Introduced `remove_surface_background` function to filter out background faces and compact geometry.
- Enhanced `build_image_mesh` to conditionally remove background faces based on a new property.
- Added `snapform_remove_background` and `snapform_keep_original` properties to operators for better control over background handling.
- Updated UI to reflect new properties and improved resolution scaling logic.
- Refactored tests to cover new background removal functionality and ensure proper geometry handling.
- Adjusted geometry nodes and validation scripts to remove references to background handling.

tests/test_image_depth.py

@@ -558,12 +558,29 @@ class ImageDepthTest(unittest.TestCase):
         ):
             self.assertAlmostEqual(value, expected)
 
-    def test_process_resolution_scales_the_image_long_edge(self):
+    def test_process_resolution_scales_long_edge_and_aligns_to_patch_size(self):
         image = SimpleNamespace(size=(1080, 1920))
 
         self.assertEqual(
-            self.image_depth.scaled_process_resolution(image, 0.5),
-            960,
+            self.image_depth.scaled_process_resolution(image, 25.0),
+            476,
+        )
+        self.assertEqual(
+            self.image_depth.scaled_process_resolution(image, 50.0),
+            966,
+        )
+
+    def test_process_resolution_clamps_to_supported_range(self):
+        large_image = SimpleNamespace(size=(4000, 3000))
+        small_image = SimpleNamespace(size=(200, 100))
+
+        self.assertEqual(
+            self.image_depth.scaled_process_resolution(large_image, 100.0),
+            1008,
+        )
+        self.assertEqual(
+            self.image_depth.scaled_process_resolution(small_image, 1.0),
+            252,
         )
 
     def test_depth_data_uses_source_image_name(self):