fix(ui): use flow autofocus for email and phone verification

[austincalvelage]

Description

Uses useFlowAutoFocus to focus the verification code input when the add-email and add-phone flows transition to verification. Moves each step into its own component and removes the dialog’s selector-based OTP focus handling.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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🦋 Changeset detected

Latest commit: fd82262

The changes in this PR will be included in the next version bump.

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