[Settings] Display user settings and allow updates

[yacosta738]

Summary:

Create the account settings screen that allows updating user profile data (e.g., name, email).

Tasks:

• Fetch current account info from /api/account
• Update form (e.g. name, email, language)
• Submit updates via /api/account

[github-actions]

This issue was marked as stale due to inactivity. It will be closed automatically in 60 days if there are no updates.