A "Client" role grants a plant's customer read-only access

A "Client" role below "Viewer" now appears in a plant's grant dialogs for the plant's customer, with an "Access until" expiry. It has access to live and historical operating data — production, battery, turbines, analysis, forecast and market prices — but not events, tickets, reports, exports, files, network or money figures, or plant push notifications.

• On the plant's members table, a member who also holds "Client" keeps "Viewer".
• In a cooperation, a "Client" share delegates only as "Client" and never widens to "Viewer".
• The role is labelled "Client" on the plant's members table.