fix(auth): redirect unverified users to email verification screen after sign-up

[CowboyGH]

🚀 Summary

Previously, when a user tried to sign up with an already-registered but unverified email, the app responded with a generic error dialog and left them on the sign-up screen with no way forward. This PR introduces dedicated handling for EmailNotVerifiedFailure on the sign-up page, mirroring the behavior already present in the sign-in flow: a non-dismissible feedback dialog appears briefly, then after 2 seconds the app automatically pushes the verify-email route so the user can complete their confirmation without manually navigating there.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b401aa53-35e6-4bb7-a123-7afd08467721

📥 Commits

Reviewing files that changed from the base of the PR and between b254e75 and b1993a0.

📒 Files selected for processing (2)

• CHANGELOG.md
• lib/features/auth/presentation/pages/sign_up_page.dart

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📝 Walkthrough

Walkthrough

The PR updates SignUpPage to handle unverified-email sign-up failures with a distinct flow: when a sign-up attempt fails with EmailNotVerifiedFailure, the app displays a non-dismissible feedback dialog, waits 2 seconds, then closes the dialog and navigates to the verify-email route. The page state now manages a root navigator reference and a redirect timer, initializing the navigator in lifecycle setup and canceling the timer on widget disposal. All other sign-up failures continue to show the standard feedback dialog. The changelog documents these lifecycle and navigation improvements.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• CowboyGH/moveUP-flutter#43: Both PRs implement the same unverified-email redirect pattern with a 2-second timed dialog dismissal and timer cleanup on dispose, applied to different auth pages (sign_up_page.dart vs sign_in_page.dart).

Suggested labels

area: ui/ux, type: bug, area: logic

Poem

🐰 A sign-up flow now shines so bright,
Two seconds of dialogue, then take flight!
Unverified emails redirect with care,
Timers and navigation, handled with flair! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main fix: closing the unverified email dialog before redirecting on sign-up. It is concise, specific, and directly relates to the primary change in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sign-up-unverified-email-redirect

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