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9ce04835da
Add a Clock Tools screen (Enter on the home Clock page) with three time utilities, plus the engine that drives them from UITask::loop() so they work regardless of the current screen / display state: - Alarm: a single one-shot wake alarm. Persisted in NodePrefs as a local time-of-day; UITask schedules it as an ABSOLUTE fire instant recomputed from that time, so it survives RTC re-syncs (mesh/app/GPS/CLI all jump the clock) — small corrections still fire on time, a jump over the target still fires (late, up to 6 h). Disarms after firing. A bell icon signals an armed alarm on the clock face and the top status bar. - Timer: a millis-based countdown (sync-immune), big HH:MM:SS readout, rings even when off-screen. - Stopwatch: millis-based, keeps running in the background. Numeric fields use the shared framework DigitEditor (digit-by-digit, min/max enforced). The alarm/timer/ring engine lives in UITask alongside the locator/live-share engines (no screen-cast for time-critical logic). E-ink: live readouts refresh coarsely (and on any key); timing is exact regardless, and the countdown's buzzer fires on time. Rings override mute and are dismissed by any key (auto-stop after 1 min). Cannot wake from a full Shutdown (CPU/RAM powered down). NodePrefs: +alarm_on/alarm_hour/alarm_min (fit existing tail padding, sizeof unchanged 2488), SCHEMA_SENTINEL 0xC0DE0016 -> 0xC0DE0017, DataStore read/clamp/write in lockstep. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>