feat: add social login support and noop screen type

[RichardHruby]

Summary

Adds support for social/SSO login buttons (Google, Apple, Microsoft, GitHub, etc.) and a new noop_screen type for external authentication flows where no browser interaction is needed.

• Social login buttons detected alongside credential forms via new socialLogins schema field
• LLM prompt updated to extract social providers instead of excluding them
• Social buttons render below the credential form with an "or" divider
• Clicking a social button triggers the OAuth redirect, then the existing page-analysis loop handles the provider's login flow naturally
• Pages with ONLY social buttons (no credential form) classify as choice_screen
• New noop_screen type for "tap the number on your phone" flows — shows instruction text with a Continue button, no browser action needed
• Collapsed form label now correctly shows the social provider name instead of field names

Changes

File	What
types.ts	SocialLoginOption schema, socialLogins field, noop_screen type
prompts.ts	Social login detection instructions, noop screen rules
agent.ts	Social login click handler, noop handler, locator validation for social buttons
credential-form.tsx	Social buttons below form with "or" divider
message-bubble.tsx	Wire social props, noop screen UI, collapsed form label fix
use-login-session.ts	formSubmitLabels tracking, noop screen as user-input type
route.ts	noop_screen added to user-action SSE path

Test plan

• Site with social + credential form shows social buttons below the form
• Clicking social button triggers OAuth redirect and page re-analysis
• Collapsed form shows provider name (e.g. "Continue with Google submitted")
• Social-only pages classify as choice_screen
• Normal credential flow unchanged
• Noop screen shows instruction text + Continue button
• npx tsc --noEmit passes

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
login-machine	Ready	Preview, Comment	Feb 18, 2026 4:35am