Office Hours Banner for Client Portal

Add the ability to display a customizable banner (like a newsbar or pre-header) at the top of the client portal that appears outside of office hours. This would let agencies set their working timezone (e.g., CET) and define office hours, so clients visiting the portal after hours see a friendly reminder — for example: "Our team operates in CET (Central European Time). We'll respond during business hours: Mon–Fri, 9:00–18:00 CET."

The banner should be fully customizable (text, colors, style), timezone-aware (auto-show/hide based on defined office hours), and configurable per portal/brand. This helps set clear response-time expectations for international clients and reduces after-hours follow-ups.