Wessel Nieboer 5f36fde054 Allow setting RTC clock backwards and fix elapsed-time underflow ... Remove the "clock cannot go backwards" restriction from all set-time paths (CLI `time`, `clock sync`, companion radio CMD_SET_DEVICE_TIME, and simple_secure_chat). The ESP32-S3 RTC drifts 5-10% during deep sleep, making backwards correction necessary after even a few days. Add safeElapsedSecs() helper in ArduinoHelpers.h that clamps elapsed time to 0 when a stored timestamp appears to be in the future after a clock correction. Applied to: - Neighbor "heard X ago" displays in simple_repeater - UI time displays in companion_radio - TimeSeriesData calculations in simple_sensor Switch BaseChatMesh connection expiry from RTC timestamps to monotonic millis(), making it immune to RTC adjustments from GPS, NTP, or manual sync. Rename last_activity to last_activity_ms to reflect the change.		2026-04-04 13:19:21 +02:00
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main.cpp	Allow setting RTC clock backwards and fix elapsed-time underflow	2026-04-04 13:19:21 +02:00