feat(auth): add a signupEmail action that opens the registration form directly

[tsahimatsliah]

What

Adds one member to OnboardingActions and its mapping:

SignupEmail = 'signupEmail'   →   AuthDisplay.Registration

Two lines in packages/shared/src/components/auth/common.tsx. The Record<OnboardingActions, AuthDisplay> type makes the enum member and its mapping a pair, so it cannot be half-added. Nothing existing changes behaviour — signup still means what it meant.

Why

daily.dev/ is getting a signup in the hero (recruiter-landing#519), behind a flag. It carries its own Google and GitHub buttons plus a "Continue with email", and that last one has nowhere good to send people.

In the app, "Continue with email" swaps the screen in place — AuthDisplay.Default → AuthDisplay.Registration — so no URL reproduces it. The closest existing action, ?action=signup, maps to AuthDisplay.Default: the provider buttons all over again, plus an email field, shown to someone who has just chosen email. It works, but it asks the same question twice.

With this action the marketing page can link straight to the account-details form, and its button behaves like the app's.

While you're in here — an unrelated bug this does not fix

/onboarding renders a completely blank page for any action it does not recognise. Verified on production just now:

URL	Result
/onboarding?action=signup	renders normally
/onboarding?action=signupEmail (before this PR)	blank body
/onboarding?action=banana	blank body

The cause looks like packages/webapp/pages/onboarding.tsx: the funnel effect reads the raw router.query.action and returns early on any truthy value, so setFunnelReady(true) never runs — while useOnboardingAuth only sets isAuthenticating for a recognised action, so the auth branch does not render either. Neither path takes it, and the component falls through to return null.

That bites a stale link, a typo, or a capitalised ?action=Signup in a campaign URL. Left alone here because it is a change to the funnel's own control flow and deserves its own review — happy to send that separately if you want it.

Test plan

• ?action=signupEmail opens the account-details form (email, name, password, username, experience, captcha).
• ?action=signup, ?action=login, ?action=verify, ?action=recover, ?action=changePassword unchanged.
• packages/shared typechecks.

🤖 Generated with Claude Code

Preview domain

https://signup-email-deep-link-dailydotd.preview.app.daily.dev

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