Automate Account Deletion for Magic and OTP Users

## Context

Issue #2335 implements automated account deletion for Guest users only. However, Magic-authenticated users and OTP-upgraded guest users still require manual deletion intervention via Slack.

## Requirement

Automate the complete account deletion flow for Magic and OTP users without requiring human intervention.

## Constraints

Unlike pure Guest accounts, Magic and OTP users may have:
- Purchased wearables
- Marketplace credits
- Other valuable account data

To prevent irreversible mistakes and user complaints, this automation must include:
- A grace period (2-3 days) before permanent deletion
- Ability to cancel/revert the deletion during the grace period
- Clear user communication about the deletion timeline

## Related

- Pre-requisite: #2335 (Guest user deletion automation)

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Requested by Rodri via Slack