- Add first_non_empty() and to_int() to core/type_utils.py
- Add get_filename_from_path() and METADATA_DIR to core/path_utils.py
- Replace inline implementations across resolver, downloader, and sources
with calls to the shared utilities
- Move strip_known_model_extension from resolver to matcher
Extract repeated path normalization and identity logic from __init__.py,
core/resolver.py, core/downloader.py, and core/scanner.py into a shared
core/path_utils module. Also add a loading state to the local model picker
so it waits for models to load before rendering options.