Fix: Resolve 'Column date cannot be null' error in FG scan

- Added default date/time handling in save_fg_scan() function
- Backend now uses current date/time if values not provided
- Added hidden date/time form fields in frontend
- Updated JavaScript to populate hidden fields before submission
- Prevents null database errors when scanning orders

app/modules/quality/quality.py

@@ -60,8 +60,16 @@ def save_fg_scan(operator_code, cp_code, oc1_code, oc2_code, defect_code, date,
         tuple: (success: bool, approved_count: int, rejected_count: int)
     """
     try:
+        from datetime import datetime
+        
         db = get_db()
         cursor = db.cursor()
+        
+        # Default to current date/time if not provided
+        if not date:
+            date = datetime.now().strftime('%Y-%m-%d')
+        if not time:
+            time = datetime.now().strftime('%H:%M:%S')
 
         # Insert a new entry - each scan is a separate record
         insert_query = """