cli: invalid --timeout values raise a raw parser exception

[kuishou68]

Summary

Passing a non-numeric timeout to the CLI currently raises a raw ValueError from float(value) instead of surfacing an argparse validation error.

Reproduction

sherlock --timeout abc testuser

Current behavior

The CLI blows up while parsing arguments instead of reporting a normal argument --timeout: ... validation error.

Expected behavior

Invalid timeout inputs should consistently be converted into ArgumentTypeError, just like zero or negative values already are, so argparse can render a clean user-facing error message.

Proposed fix

Wrap the float(value) conversion in timeout_check() and re-raise invalid inputs as ArgumentTypeError, then add a regression test for invalid timeout values.

[kuishou68]

I’m taking this one and have a small fix + regression test prepared.

[kuishou68]

Fix is up in #2867.