Implement a comprehensive online status monitoring system:
- OnlineStatusService: Centralized service for checking device/sensor
online status with caching, configurable thresholds, and batch operations
- useOnlineStatus hook: React hook for easy component integration with
auto-polling, loading states, and app state handling
- Support for status levels: online (<5 min), warning (5-60 min), offline (>60 min)
- Utility functions for status colors, labels, and formatting
Includes 49 passing tests covering service and hook functionality.
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Co-Authored-By: Claude <noreply@anthropic.com>
Sergei
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