Settings Redesign

The settings area has been completely reorganized for easier navigation and renamed from "Business Settings" to simply Settings.

• Sidebar navigation — Settings now use a grouped sidebar instead of tabs, making it easier to find what you need
• Grouped sections — Settings are organized into logical groups: General, Payments, Members, Scheduling, and Data
• Activity Log & Migrations — Both are now accessible directly from the Settings sidebar
• My Plan redesign — The subscription management page has been refreshed with a cleaner layout
• Consistent UI — All settings pages now share a uniform look and feel