v1.1 - Merchant Dashboard

First major feature release after the initial launch. Adds a full merchant-facing dashboard for tracking sales and managing the point-of-sale flow.

What’s new

Merchant dashboard — a dedicated view showing daily sales totals, recent transactions, and a live payment feed
Transaction export — merchants can download a CSV of their transaction history for accounting purposes
Role-based access — separate roles for admin, merchant, and cashier with appropriate permission levels
PIN-based cashier login — simplified 4-digit PIN authentication for shared point-of-sale devices
Dark mode UI — full dark theme now available and set as default on new deployments

Fixed an issue where session tokens were not invalidated after password change
Fixed incorrect timezone display on transaction timestamps for deployments outside UTC

Run database migrations after updating:

npm run db:migrate

Existing admin accounts will retain their role. New merchant and cashier roles must be assigned manually by an admin.