fix(auth): include fetch in the retry callback deps

[JOY (JOY)]

What kind of change does this PR introduce?

Bug fix (lint/compiler compliance). One-line dependency fix in apps/frontend/src/components/auth/register.tsx: the AuthErrorState retry useCallback now includes fetch in its dependency array ([attempts, fetch]). No behavior change.

Why was this change needed?

The eslint 9 SARIF pipeline (live since the eslint 9 migration) flagged the auth error component during the dev->main promote check: react-hooks/preserve-manual-memoization (error level - React Compiler skipped optimization because the inferred deps did not match the manually specified ones) plus an exhaustive-deps warning for the missing fetch reference. Aligning the deps resolves both and lets the compiler preserve its optimization.

Technical Details & Scope

• apps/frontend/src/components/auth/register.tsx: single line, deps array of the retry callback only.

Verification & Testing

• CI build.yml + branding-guard on this PR; the promote PR re-runs the SARIF check and should report zero new alerts after this lands.

QA

1. CI green on this PR
2. After merge, the dev->main promote PR re-runs the ESLint SARIF check - confirm zero new ESLint alerts
3. Confirm the auth error page still renders and retries (manual QA on beta after the promote deploy)

Checklist:

• My code follows the project's code style and architectural conventions.
• Local verification - CI is the gate.
• Branding guard - CI gate on this PR.
• Tests - existing suites unaffected.
• Documentation n/a.
• No secrets included.
• QA section filled with real steps.

[gemini-code-assist]

Code Review

This pull request updates the dependency array of a hook in the AuthErrorState component within register.tsx to include fetch alongside attempts. There are no review comments, and I have no feedback to provide.