The desktop app imported any argument it didn't know as a file (writing it to Recent Footage)
and dropped a missing or non-numeric --control value, starting without a control server.
parse_args now returns an error for an unknown option, a --control value that isn't a port from
1 to 65535, or a bad EFFECTCRAFT_CONTROL_PORT (checked only when --control isn't given); main
prints it and exits with status 1 before anything starts. --control=<port> works, and -- ends
the options so a file named -x can still be opened.
Tests: parse_args unit tests, and tests/args.rs runs the binary with its own settings folder
and checks the exit, the message and that nothing was written.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
