Fix Emby TV episode date handling by using <aired> field for import dates

- Issue: Emby displays DateCreated field which gets updated on metadata refresh
- Root cause: Emby ignores <dateadded> but reads <aired> for TV episodes
- Solution: Write import date to <aired> field instead of actual air date
- Emby will now display import date (Feb 19) instead of scan date (Sep 11)
- Maintains backward compatibility with fallback to actual air date

core/nfo_manager.py

@@ -261,17 +261,18 @@ class NFOManager:
                     xml_lines.append(f"  <rating>{imdb_rating}</rating>")
                     xml_lines.append(f"  <votes>{imdb_votes}</votes>")
         
-        if aired:
-            # Extract date part from ISO string  
+        if dateadded:
+            # For Emby TV episodes: Use dateadded (import date) as aired date
+            # This ensures Emby displays the import date instead of scan date
+            import_date = dateadded.split('T')[0]
+            xml_lines.append(f"  <aired>{import_date}</aired>")
+            xml_lines.append(f"  <dateadded>{dateadded}</dateadded>")
+            xml_lines.append(f"  <premiered>{import_date}</premiered>")
+        elif aired:
+            # Fallback: Use actual air date if no import date available
             air_date = aired.split('T')[0]
             xml_lines.append(f"  <aired>{air_date}</aired>")
         
-        if dateadded:
-            xml_lines.append(f"  <dateadded>{dateadded}</dateadded>")
-            # Add premiered tag for broader compatibility
-            premiered_date = dateadded.split('T')[0]
-            xml_lines.append(f"  <premiered>{premiered_date}</premiered>")
-        
         if lock_metadata:
             xml_lines.append("  <lockdata>true</lockdata>")