Improve error handling for disconnection of source (volumes)

[evhpomfort]

Improve the general error handling when a source (volume) unmounts during verification.
Currently, unmounting a volume leads to an unhandled exception:

Fri, 31 Oct 2025 13:29:12 GMT Traceback (most recent call last):
Fri, 31 Oct 2025 13:29:12 GMT   File "click/core.py", line 1688, in invoke
Fri, 31 Oct 2025 13:29:12 GMT   File "click/core.py", line 1434, in invoke
Fri, 31 Oct 2025 13:29:12 GMT   File "click/core.py", line 783, in invoke
Fri, 31 Oct 2025 13:29:12 GMT   File "click/core.py", line 1157, in __call__
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/commands.py", line 339, in create_for_folder_subcommand
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/commands.py", line 1993, in seal_file_path
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/hasher.py", line 405, in multiple_format_hash_file
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/hasher.py", line 291, in hash_file
Fri, 31 Oct 2025 13:29:12 GMT OSError: [Errno 6] Device not configured
Fri, 31 Oct 2025 13:29:12 GMT [PYI-11462:ERROR] Failed to execute script 'ascmhl' due to unhandled exception!
Fri, 31 Oct 2025 13:29:12 GMT   File "click/core.py", line 1078, in main
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/cli/ascmhl.py", line 49, in <module>
Fri, 31 Oct 2025 13:29:12 GMT   File "ascmhl/commands.py", line 205, in create

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