fix: Windows paths handling

[plu5]

On Windows, pathlib paths are of type WindowsPath, so do not pass type(path) is PosixPath checks. Check instead for the parent class Path, so that both PosixPath and WindowsPath get correctly handled.

This caused sqlite queries in db.py functions to fail with:

sqlite3.InterfaceError: Error binding parameter 1 - probably unsupported type.

because instead of str, WindowsPath was being passed as the file_path parameter.