`npmx-connector` should enforce `--registry` when executing `npm login`

[typed-sigterm]

Describe the bug

❯ bunx npmx-connector
┌   npmx connector
│
▲  This allows npmx.dev to access your npm cli and any authenticated contexts.
│
◇  Do you accept?
│  Yes
│
●  Checking npm authentication...
(node:7228) [DEP0190] DeprecationWarning: Passing args to a child process with shell option true can lead to security vulnerabilities, as the arguments are not escaped, only concatenated.
(Use `node --trace-deprecation ...` to show where the warning was created)
│
▲  Not logged in to npm. Starting npm login...

npm notice Log in on https://registry.npmmirror.com/
Login at:
https://registry.npmmirror.com/-/v1/login/request/session/***
Press ENTER to open in the browser...

Since npmx only supports npmjs.com registry, it should execute npm login --registry=https://registry.npmjs.com/ to overrides .npmrc registry settings.

Additional context

No response

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