Use parent folder name as artist override in auto-import

When staging files are organized as Artist/Albums/AlbumFolder or
Artist/AlbumFolder, the auto-import now uses the parent folder name
as the artist instead of trusting embedded file tags.

Uses relative path from staging root to determine folder depth, so
albums directly in staging root don't accidentally pick up container
paths as artist names. Common category subfolder names (Albums,
Singles, EPs, Mixtapes, etc.) are recognized and skipped.

Fixes mixtapes and compilations where file tags have DJ names or
incorrect artists (e.g. files tagged as "Slim" in a 2Pac folder).

core/auto_import_worker.py

@@ -968,6 +968,34 @@ class AutoImportWorker:
         artist_name = identification.get('artist_name', 'Unknown')
         album_name = identification.get('album_name', 'Unknown')
         image_url = identification.get('image_url', '')
+
+        # Parent folder artist override: if the staging folder structure is
+        # Artist/Albums/AlbumName or Artist/AlbumName, use the parent folder
+        # as the artist name when the tag-extracted artist looks wrong.
+        # This handles mixtapes/compilations where embedded tags have DJ names.
+        try:
+            staging_root = self._resolve_staging_path() or self.staging_path
+            rel_path = os.path.relpath(candidate.path, staging_root)
+            parts = [p for p in rel_path.replace('\\', '/').split('/') if p]
+
+            # parts[0] = artist folder, parts[1] = album or category subfolder, etc.
+            # Only attempt override if there's at least 2 levels (artist/album)
+            folder_artist = None
+            if len(parts) >= 2:
+                _category_names = {'albums', 'singles', 'eps', 'compilations', 'mixtapes',
+                                   'discography', 'music', 'downloads'}
+                if len(parts) >= 3 and parts[1].lower() in _category_names:
+                    # Artist/Albums/AlbumFolder → parts[0] is artist
+                    folder_artist = parts[0]
+                elif parts[0].lower() not in _category_names:
+                    # Artist/AlbumFolder → parts[0] is artist
+                    folder_artist = parts[0]
+
+            if folder_artist and folder_artist.lower() != artist_name.lower():
+                logger.info(f"[Auto-Import] Parent folder artist '{folder_artist}' differs from tag artist '{artist_name}' — using folder artist")
+                artist_name = folder_artist
+        except Exception:
+            pass
         release_date = identification.get('release_date', '') or album_data.get('release_date', '')
 
         # Compute total discs