By: Michael Lynch <git@mtlynch.io>
Use a sentinel error for missing Tinybeans thumbnails Return a package-level sentinel error when a non-photo Tinybeans entry omits its thumbnail path, then assert it with errors.Is in tests. This simplifies the error surface without preserving a custom struct only for type matching. Also remove the redundant local alias in parseAndConvert so the importer reads source entries directly from tinybeansData.