Fix/emergency alert persistence#6
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- Raise MQ9_DANGER_THRESHOLD from 2000 to 3500 - Increase DANGER_MULTIPLIER from 1.4x to 2.0x for more headroom - Gate CO audio alerts behind SENSOR_FULLY_PREHEATED flag - Require digital pin (mq9_digital) confirmation before playing alert - Remove forced-static-threshold calibration shortcut for MQ-9 - Add serial warmup warning when digital pin is high during preheat The MQ-9 requires 48 hours of continuous power to stabilize. Until SENSOR_FULLY_PREHEATED is set to true, the helmet will log but not audio-alert on CO readings, preventing false alarms from sensor drift. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Add localStorage-based emergency acknowledgment tracking - Emergency modal only shows once per emergency; acknowledged ones are stored in localStorage and never re-trigger on page refresh - Acknowledging an alert now sets emergencyActive=false, hiding both the modal AND the persistent red badge/banner permanently - AdminDashboard: add 5-minute cooldown for emergency incident creation (was missing, causing potential incident spam) - On page load, both dashboards now query the most recent emergency row specifically (not just the latest row) so alerts aren't missed when newer non-emergency rows have arrived - SupervisorDashboard: acknowledged-list guard added to realtime handler so acknowledged emergencies from other tabs don't re-alert Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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