fix: Improve title detection logic to prevent duplicates

- Fix flawed title detection that caused duplicates when migrating NFOs
- Add robust title validation (check for non-empty, non-whitespace text)
- Improve debugging output to show title detection process
- Properly handle existing valid titles vs missing/empty titles
- Remove invalid title elements before adding filename-extracted titles

Resolves duplicate <title> elements in NFO files during migration.

core/nfo_manager.py

@@ -696,15 +696,19 @@ class NFOManager:
                     runtime_elem = ET.SubElement(episode, "runtime")
                     runtime_elem.text = str(enhanced_metadata["runtime"])
             
-            # Fallback: Extract title from filename if no title present
+            # Fallback: Extract title from filename if no valid title present
-            if not episode.find("title") or not episode.find("title").text:
+            title_elem = episode.find("title")
-                print(f"🔍 No title found in NFO for S{season_num:02d}E{episode_num:02d}, attempting filename extraction")
+            has_valid_title = title_elem is not None and title_elem.text and title_elem.text.strip()
+            
+            print(f"🔍 Title check for S{season_num:02d}E{episode_num:02d}: has_element={title_elem is not None}, has_text={title_elem.text if title_elem is not None else 'N/A'}, has_valid_title={has_valid_title}")
+            
+            if not has_valid_title:
+                print(f"🔍 No valid title found in NFO for S{season_num:02d}E{episode_num:02d}, attempting filename extraction")
                 filename_title = self._extract_title_from_filename(season_dir, season_num, episode_num)
                 if filename_title:
-                    # Remove existing empty title element if present
+                    # Remove existing empty/invalid title element if present
-                    existing_title = episode.find("title")
+                    if title_elem is not None:
-                    if existing_title is not None:
+                        episode.remove(title_elem)
-                        episode.remove(existing_title)
                     
                     # Add new title element
                     title_elem = ET.SubElement(episode, "title")
@@ -712,6 +716,8 @@ class NFOManager:
                     print(f"✅ Added filename-extracted title to NFO: S{season_num:02d}E{episode_num:02d} - '{filename_title}'")
                 else:
                     print(f"⚠️ Could not extract title from filename for S{season_num:02d}E{episode_num:02d}")
+            else:
+                print(f"✅ Valid title already exists in NFO for S{season_num:02d}E{episode_num:02d}: '{title_elem.text.strip()}')")
             
             # Add NFOGuard fields at the bottom