fix(Auth): Find username fields labelled 'user name'

[smockle]

Fixes https://github.com/github/continuous-ai-for-accessibility/issues/80 (Hubber access only)

This PR updates the “Auth” sub-action to find username fields labelled “user name” or “username”.

Before https://github.com/github/accessibility-sandbox/actions/runs/18947551717/job/54103069255 (Hubber access only):

Starting 'auth' action
Navigating to login page
Checking for login form
No login form detected
Finished 'auth' action

After https://github.com/github/accessibility-sandbox/actions/runs/18947605567/job/54103255182 (Hubber access only):

Starting 'auth' action
Navigating to login page
Checking for login form
Filling username
Filling password
Logging in
Finished 'auth' action

[Copilot]

Pull Request Overview

This PR updates the username field selector in the authentication action to handle variations in spacing within the label text. The regular expression now matches both "username" and "user name" (with optional space).

Key Changes:

• Modified the username field selector regex to account for optional whitespace

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