FR-06: Update Profile

Description

As a registered user, I want to update my profile information (name, date of birth, phone number, etc.) so that my details remain up to date.

Context

This page should be at /me/details and use a different controller for it.

Acceptance criteria

• AC1 - An authenticated user should be able to edit their profile information.
• AC2 - The user should be prompted with error messages if any of the new values are empty.

Dependencies

Requires #12 (closed) Requires #46 (closed)