fix: Add missing execution_id initialization

Fixed NameError: 'execution_id is not defined'

- Initialize execution_id = session_id before use
- Added missing pipeline record creation code
- execution_id gets set from pipeline_manager.create_pipeline_record()
- Falls back to session_id if pipeline creation fails
- Fixed typo in processing message

This completes the pipeline record creation feature.

app.py

@@ -1090,8 +1090,26 @@ Here's what I'll do:
             
             plan = session.get("proposed_pipeline", {})
             
+            # V3: Initialize execution_id before use (fallback to session_id)
+            execution_id = session_id
+            
+            # V3: Create pipeline record BEFORE execution
+            try:
+                pipeline_mgr = get_pipeline_manager()
+                execution_id = pipeline_mgr.create_pipeline_record(
+                    session_id=session_id,
+                    pipeline_definition=plan,
+                    created_from="request",
+                    created_by_message=message
+                )
+                print(f"✅ Created pipeline record: {execution_id}")
+            except Exception as e:
+                print(f"⚠️ Failed to create pipeline record: {e}")
+                print(f"   Using session_id as fallback")
+                # execution_id already initialized to session_id
+            
             # Initial status - User-friendly
-            initial_message = f"✅ **Approved!** Starting execution of: **{plan.get('pipeline_name', 'pipeline')}**\n\n🚀 Processingplease wait...\n_(Using {plan.get('_generator', 'AI')} - {plan.get('_model', 'model')})_"
+            initial_message = f"✅ **Approved!** Starting execution of: **{plan.get('pipeline_name', 'pipeline')}**\n\n🚀 Processing... please wait...\n_(Using {plan.get('_generator', 'AI')} - {plan.get('_model', 'model')})_"
             yield format_chat_history(history, message, initial_message)
             
             steps_completed = []