* fix: enhance artist folder detection with directory traversal
Enhanced fromArtistFolder function to implement directory traversal fallback for finding artist images. The original implementation only searched in the calculated artist folder, which failed for single album artists where artist.jpg files were not detected.
Changes: Modified fromArtistFolder to search up to 3 directory levels (artist folder + 2 parent levels), extracted findImageInFolder helper function for cleaner code organization, added proper boundary checks to prevent infinite traversal, maintained backward compatibility with existing functionality.
This fix ensures artist.jpg files are properly detected for single album artists while preserving all existing behavior for multi-album artists.
* refactor: address PR review suggestions
Applied review suggestions from gemini-code-assist bot:
- Added maxArtistFolderTraversalDepth constant instead of hardcoded value 3
- Updated error message to mention that parent directories were also searched
- Enhanced test assertion to verify the improved error message
* fix: improve artist folder traversal logic and enhance error logging
Signed-off-by: Deluan <deluan@navidrome.org>
* fix: remove test for special glob characters in artist folder detection
Signed-off-by: Deluan <deluan@navidrome.org>
* fix: add logging for artist image search in folder
Signed-off-by: Deluan <deluan@navidrome.org>
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Signed-off-by: Deluan <deluan@navidrome.org>
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