Add POST /api/alerts/acknowledge-all endpoint to bulk acknowledge all unacknowledged alerts. Add "Ack All" button to alerts page header with confirmation dialog for quick dismissal of all pending alerts.
- Overhaul CSS with comprehensive design tokens (shadows, transitions, radii) - Add hover effects and smooth transitions to cards, buttons, tables - Improve typography hierarchy and color consistency - Remove inline styles from 10 template files for better maintainability - Add global notification container to ensure toasts appear above modals - Update showNotification/showAlert functions to use centralized container - Add accessibility improvements (focus states, reduced motion support) - Improve responsive design and mobile styling - Add print styles
