fix: add autoComplete attribute for Apple 2FA autofill

[SaaiAravindhRaja]

Fixes #1167

Problem

Apple's auto-fill feature fills "I n f i s i" instead of the verification code because the input fields are missing the autoComplete="one-time-code" attribute.

Solution

Added autoComplete="one-time-code" to all ReactCodeInput components in:

• CodeInputStep.tsx (email verification during signup)
• Mfa.tsx (MFA code input during login)

This tells Apple's autofill system that these fields expect one-time codes from emails/SMS.

[maidul98]

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds autoComplete="one-time-code" to OTP/MFA ReactCodeInput components used during signup email verification (CodeInputStep.tsx) and login MFA flows (Mfa.tsx). This enables better iOS/Apple one-time-code autofill behavior for 2FA inputs without changing authentication logic or API interactions.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• Changes are limited to adding a standard HTML autocomplete hint on existing OTP code inputs; no logic, security boundaries, or API/query behavior is modified.
• No files require special attention

Important Files Changed

Filename	Overview
frontend/src/components/auth/CodeInputStep.tsx	Adds autoComplete="one-time-code" to the signup email verification ReactCodeInput fields to improve iOS OTP autofill behavior.
frontend/src/components/auth/Mfa.tsx	Adds autoComplete="one-time-code" to MFA ReactCodeInput fields (email/TOTP) to improve iOS OTP autofill behavior.

[SaaiAravindhRaja]

Thank you @maidul98 😆