Returns the authenticated user's account profile including userId, name, email, plan with feature details, personal display limits (maxPersonalDisplays, currentPersonalDisplays, remainingPersonalDisplays), total accessible displays across all organizations, organization memberships summary and points balance. Use this to answer questions about the user's subscription, display quota, organization memberships or plan capabilities. Requires authentication with at least content_only scope. Do not use this to list displays — use list_displays instead.