Make the day-bar sleep pill a one-tap toggle

Once the big timer scrolls away, the pill in the day bar is the only thing
still showing the sleep state — but acting on it meant scrolling back up to
the quick actions. Tapping the pill now logs the boundary that ends the state
it displays: sleep-end while asleep, sleep-start while awake. It routes
through quickLog(), so the snackbar and its undo behave exactly as they do
from the buttons, and the state is read from currentSleepState() rather than
the cached bigClockState so a tap can't act on a stale render.

The pill becomes a real <button>, which brings keyboard operation along for
free. In standby it is visibility:hidden, so while the big card is on screen
it is neither clickable nor tab-reachable, and the toggle is live exactly when
the pill is visible.

The .day-bar button padding and :disabled rules are scoped to :not(.bar-clock)
so they don't start outranking the pill's own sizing, and the default accent
button background is reset since the asleep/awake classes paint it.

src/changelog.json

@@ -1,4 +1,5 @@
 [
+  { "date": "2026-08-21", "text": "The sleep timer pill in the day bar — the one that appears once you've scrolled past the big timer — is now tappable: tap it while the puppy is asleep to log the wake-up, or while awake to log a sleep start, without scrolling back up to the buttons" },
   { "date": "2026-08-20", "text": "Added reminders: turn them on in Settings and your phone gets a notification when it's time to sleep (\"Awake for 45 min\") or when there's been no pee, poo or meal for a while. Each one has its own interval, they arrive even with the app closed, and they stay quiet while the puppy is logged as asleep so you're not nagged all night. On iPhone, add Puppy Tracker to your Home Screen first — iOS only allows notifications for installed apps" },
   { "date": "2026-08-18", "text": "The sleep button that would just repeat the last one is now disabled: while asleep you can only tap ⏰ Sleep end, and while awake only 😴 Sleep start — no more accidental double taps creating zero-length sleep windows. If you did miss a boundary, you can still add it at the right time from the event log" },
   { "date": "2026-08-02", "text": "Added free-text notes: tap 📝 Note to jot down things that happened on a day — vaccinations, vet visits, milestones — with a date, optional photo, and any text. All your notes are collected in a new Notes section that stays visible whatever day you're viewing, so you can see at a glance when things like a tick vaccination were done" },