fix: Add title enhancement for existing NFO files

- Modify extract_nfoguard_dates_from_episode_nfo() to detect missing titles
- Add enhance_existing_episode_nfo_with_title() method to update NFOs with titles
- Enhance Tier 1 processing to check for missing titles in existing NFO files
- Extract titles from filenames and update existing NFOs that lack title elements
- Fix NFO filename case to match S01E01.nfo format
- Preserves all existing NFO content while adding missing title elements

Addresses issue where existing NFO files with NFOGuard metadata were
skipping title extraction due to Tier 1 optimization caching.

core/nfo_manager.py

@@ -163,7 +163,7 @@ class NFOManager:
     
     def extract_nfoguard_dates_from_episode_nfo(self, season_path: Path, season_num: int, episode_num: int) -> Optional[Dict[str, str]]:
         """Extract NFOGuard-managed dates from existing episode NFO file"""
-        nfo_filename = f"s{season_num:02d}e{episode_num:02d}.nfo"
+        nfo_filename = f"S{season_num:02d}E{episode_num:02d}.nfo"
         nfo_path = season_path / nfo_filename
         
         if not nfo_path.exists():
@@ -190,7 +190,11 @@ class NFOManager:
                 if aired_elem is not None and aired_elem.text:
                     result["aired"] = aired_elem.text.strip()
                     
-                print(f"✅ Found NFOGuard data in episode NFO S{season_num:02d}E{episode_num:02d}: dateadded={result['dateadded']}, aired={result.get('aired', 'None')}")
+                # Check if title is missing
+                title_elem = root.find('.//title')
+                result["has_title"] = title_elem is not None and title_elem.text and title_elem.text.strip()
+                
+                print(f"✅ Found NFOGuard data in episode NFO S{season_num:02d}E{episode_num:02d}: dateadded={result['dateadded']}, aired={result.get('aired', 'None')}, has_title={result['has_title']}")
                 return result
                 
         except (ET.ParseError, Exception) as e:
@@ -199,6 +203,51 @@ class NFOManager:
             
         return None
     
+    def enhance_existing_episode_nfo_with_title(self, season_path: Path, season_num: int, episode_num: int, title: str) -> bool:
+        """Add title to existing episode NFO file that's missing one"""
+        nfo_filename = f"S{season_num:02d}E{episode_num:02d}.nfo"
+        nfo_path = season_path / nfo_filename
+        
+        if not nfo_path.exists():
+            return False
+            
+        try:
+            tree = ET.parse(nfo_path)
+            root = tree.getroot()
+            
+            # Check if title already exists
+            existing_title = root.find('.//title')
+            if existing_title is not None and existing_title.text and existing_title.text.strip():
+                return False  # Title already exists
+            
+            # Add title element (insert near the top, after any existing plot element)
+            title_elem = ET.Element("title")
+            title_elem.text = title
+            
+            # Find the best position to insert title (after plot if it exists, otherwise at the beginning)
+            plot_elem = root.find('.//plot')
+            if plot_elem is not None:
+                # Insert after plot
+                plot_index = list(root).index(plot_elem)
+                root.insert(plot_index + 1, title_elem)
+            else:
+                # Insert at the beginning (after any existing title that might be empty)
+                if existing_title is not None:
+                    title_index = list(root).index(existing_title)
+                    root.remove(existing_title)
+                    root.insert(title_index, title_elem)
+                else:
+                    root.insert(0, title_elem)
+            
+            # Write the updated NFO
+            tree.write(nfo_path, encoding='utf-8', xml_declaration=True)
+            print(f"📝 Enhanced existing NFO with title: S{season_num:02d}E{episode_num:02d} - '{title}'")
+            return True
+            
+        except Exception as e:
+            print(f"⚠️ Error enhancing NFO with title: {e}")
+            return False
+    
     def _parse_nfo_with_tolerance(self, nfo_path: Path):
         """Parse NFO file with tolerance for URLs appended after XML"""
         try: