Haptic feedback, button morph, dial slide, heads-up notification

[Xitee1]

Summary

• Haptics: play/stop (CONFIRM) and +/- (CLOCK_TICK) now trigger haptic feedback, gated by the existing hapticFeedbackEnabled setting
• Play button morph: circle (idle) ↔ rounded square (running), 240ms FastOutSlowInEasing; play/stop icons crossfade
• Dial slide: smooth animation on +/- jumps whether the timer is idle or running; countdown ticks snap. Single source of truth via Animatable, threshold-based snap/animate (δ<1 min → snap; dragging → snap)
• Heads-up notification: appears once on start only (setOnlyAlertOnce), ported to a fresh channel (sleep_timer_v2, IMPORTANCE_HIGH, sound/vibration disabled). Previous setSilent(true) was suppressing heads-up
• -5 min action added to the notification, placed before +5
• remainingMillisToDisplayMinutes helper in core:data fixes the "30 → 29 after one second" rounding bug in the notification and unifies the ceiling logic with the on-dial time display. TimerUiState.Running now carries remainingMillis instead of derived remainingMinutes/remainingSeconds

Test plan

• Haptic: play/stop feels distinct from +/-; silenced when hapticFeedbackEnabled=false
• Play button: morphs between circle and rounded square on start/stop; shadow follows the shape
• Dial: +5/-5 slides smoothly both idle and while running; drag feels immediate (no slide lag); countdown motion unchanged
• Notification: heads-up appears on Start only, not on every second; no sound, no vibration
• Notification actions: -5 | +5 | Cancel shown in that order, all fire correctly
• Notification minute count shows starting value (e.g. 30) for the first 60 seconds, not 29 after the first tick

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