Enhance device management and model handling in SnapForm

- Updated frame extraction logic to allow for single frame extraction.
- Integrated model readiness checks for BEN2 and DA3 models in relevant operators.
- Added directory name attribute to model specifications for better organization.
- Improved device selection logic for production and debug tasks.
- Refactored preferences to expose device settings and ensure they reflect available hardware.
- Enhanced runtime device detection and management, including support for CUDA and MPS.
- Updated tests to cover new device management features and model directory handling.
- Removed deprecated download model tests to streamline codebase.

tests/test_image_depth.py

@@ -209,6 +209,21 @@ class ImageDepthTest(unittest.TestCase):
             (1, 1),
         )
 
+    def test_extract_frame_range_honors_single_frame_setting(self):
+        source_object = SimpleNamespace(
+            data=SimpleNamespace(source="MOVIE", frame_duration=97),
+            image_user=SimpleNamespace(
+                frame_start=1,
+                frame_offset=70,
+                frame_duration=1,
+            ),
+        )
+
+        self.assertEqual(
+            self.image_depth.extract_frame_range(source_object),
+            (71, 1),
+        )
+
     def test_configure_image_user_preserves_cyclic_setting(self):
         image_user = SimpleNamespace(
             frame_start=0,