Release v0.4.0 — Ferber Mode · liviro/boob-o-clock

What's new

Opt-in per night at Start Night: toggle Ferber mode and pick the night number (1-7); "night 8+" clamps to night 7 intervals
New Learning state: countdown to the next check-in with live mood (quiet / fussy / crying) and Settled / Give Up actions
New Check In state: mood-change or return-to-learning, server tracks check-in count and time-to-settle
Graduated interval table lives server-side (reports.IntervalFor); the client is a pure subtracter of two timestamps
Mood metadata is validated at the domain layer on every Ferber entry (put_down_awake_ferber, baby_stirred_ferber, mood_change)
"Start night" form remembers your last Ferber night and suggests night N+1 for tonight

Per-night Ferber panel on Night Detail: sessions, check-ins, avg time-to-settle, cry / fuss / quiet time
Three new trend charts (cry time, check-ins, time-to-settle) surface only once you have Ferber data
Sage-green markers highlight Ferber nights on every non-Ferber trend chart so you can see both axes at a glance

Dedicated POST /api/session/start for starting a night (only action that creates a row, only action taking typed config)
Session response carries nested ferber?.current? with server-computed checkInAvailableAt — presence encodes state ("Ferber night" / "in session" / "Learning specifically")
Unified NightHourChart replaces the feed-scatter and bedtime charts with one primitive; consolidated ~100 LOC
Single-interval useNow hook shared across components (was: per-component timers drifting against each other)

Sentence-case button labels everywhere
Tracker states got per-state layout polish (awake, feeding, resettling, checking-in)
ESLint with react-hooks/exhaustive-deps as an error

State machine: 13 states, 41 transitions