Add test for processor control re-enable

Adds a GUI regression test to ensure processor-related controls are disabled while inference is active and properly re-enabled when it stops. Also updates plugin system docs by fixing a description typo and aligning the toggle name to "Use custom processor".

Author: C-Achard

dlclivegui/processors/PLUGIN_SYSTEM.md

@@ -58,7 +58,7 @@ Each processor class should define metadata attributes to help GUI discovery:
 ```python
 class MyProcessorSocket(BaseProcessorSocket):
     PROCESSOR_NAME = "Use Pose Processor"  # Human-readable
-    PROCESSOR_DESCRIPTION = "BBroadcasts processed pose values"
+    PROCESSOR_DESCRIPTION = "Broadcasts processed pose values"
     PROCESSOR_PARAMS = {
         "bind": {
             "type": "tuple",
@@ -160,7 +160,7 @@ New processor modules should rely on subclass discovery instead of defining a re
 
 ### Recommended behavior
 
-To keep processor behavior explicit and opt-in, the GUI provides an **Allow processor-based control** toggle with these effects:
+To keep processor behavior explicit and opt-in, the GUI provides an **Use custom processor** toggle with these effects:
 
 - **Disabled by default:**
   - The GUI does **not instantiate** any processor plugin

tests/gui/test_main.py

@@ -175,3 +175,25 @@ def test_dlc_settings_from_ui_validates_detected_model_type(
 
     assert settings.model_type == "pytorch"
     assert isinstance(settings.model_type, str)
+
+
+def test_processor_controls_reenabled_after_inference_stops(
+    window,
+):
+    window._dlc_active = True
+    window._update_dlc_controls_enabled()
+
+    assert not window.processor_folder_edit.isEnabled()
+    assert not window.browse_processor_folder_button.isEnabled()
+    assert not window.refresh_processors_button.isEnabled()
+    assert not window.processor_combo.isEnabled()
+    assert not window.use_custom_proc_checkbox.isEnabled()
+
+    window._dlc_active = False
+    window._update_dlc_controls_enabled()
+
+    assert window.processor_folder_edit.isEnabled()
+    assert window.browse_processor_folder_button.isEnabled()
+    assert window.refresh_processors_button.isEnabled()
+    assert window.processor_combo.isEnabled()
+    assert window.use_custom_proc_checkbox.isEnabled()