Added 4 tests covering previously untested scenarios:
- Agent with warning status (2-5 minutes offline)
- Agent with offline status (>5 minutes offline)
- Last seen time formatting (hours and days)
Coverage increased from 80% to near 100%.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>