fix(authenticator): redirect to sign-in after account confirmation

[osama-rizk]

Description of changes

Fix authenticator signup confirmation flow to redirect users to sign-in screen instead of signup screen when coming from refresh scenario. This improve the UX where users who refresh the page between signup and email confirmation are incorrectly redirected back to the signup flow after confirming their email.

Changes:
• Add shouldManualSignIn guard to detect refresh scenario (DONE + CONFIRM_SIGN_UP context)
• Add manualSignIn state that redirects to sign-in screen with setSignInStep action
• Update confirmSignUp onDone handlers to include shouldManualSignIn condition
• Add console logs for debugging and verification

Behavior:
• Normal flow: User signs up → confirms email → auto signed in ✅
• Refresh flow: User signs up → refresh → sign in → confirms email → redirected to sign-in screen ✅

Issue #, if available

Fixes inconsistent user experience in signup confirmation flow after page refresh.

Description of how you validated changes

• Tested both normal signup flow (auto sign-in works)
• Tested refresh scenario (now redirects to sign-in instead of signup)

Checklist

• [x] Have read the Pull Request Guidelines
• [x] PR description included
• [ ] yarn test passes and tests are updated/added
• [x] PR title and commit messages follow conventional commit syntax
• [x] If this change should result in a version bump, changeset added (This can be done
after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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Latest commit: 7a6aac2

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