fix(vwb): Supprimer debug /tmp et corriger import UIElement

- Supprimer le bloc debug qui écrivait dans /tmp/vwb_debug.log
- Corriger l'import UIElement (core.models.ui_element au lieu de
  screen_state) — supprime le warning au démarrage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

visual_workflow_builder/backend/app.py

@@ -238,20 +238,6 @@ def execute_workflow_step():
         step_type = data.get('stepType', 'click_anchor')
         parameters = data.get('parameters', {})
 
-        # DEBUG: Écrire les données reçues dans un fichier
-        import json as json_module
-        with open('/tmp/vwb_debug.log', 'a') as debug_file:
-            debug_file.write(f"\n{'='*60}\n")
-            debug_file.write(f"[execute-step] stepType={step_type}, stepId={step_id}\n")
-            debug_file.write(f"[execute-step] parameters keys: {list(parameters.keys())}\n")
-            if 'visual_anchor' in parameters:
-                va = parameters['visual_anchor']
-                debug_file.write(f"[execute-step] visual_anchor keys: {list(va.keys()) if va else 'None'}\n")
-                debug_file.write(f"[execute-step] visual_anchor.id: {va.get('id')}\n")
-                debug_file.write(f"[execute-step] visual_anchor.thumbnail_url: {va.get('thumbnail_url') or (va.get('metadata', {}) or {}).get('thumbnail_url')}\n")
-                debug_file.write(f"[execute-step] FULL visual_anchor: {json_module.dumps(va, default=str)[:500]}\n")
-            debug_file.flush()
-
         # Convert to catalog execute format
         catalog_request = {
             'type': step_type,

visual_workflow_builder/backend/services/real_screen_capture.py

@@ -36,7 +36,8 @@ except ImportError as e:
     UIDetector = None
 
 try:
-    from core.models.screen_state import ScreenState, UIElement
+    from core.models.screen_state import ScreenState
+    from core.models.ui_element import UIElement
     SCREEN_STATE_AVAILABLE = True
 except ImportError as e:
     print(f"Warning: ScreenState non disponible: {e}")