Add guest/account auth flows, order tracking, and order history UI

- Wire up Better Auth (email/password + Google/Apple SSO) with a
  sign-in/sign-up UI, header account menu, and a basket that follows
  the signed-in-or-guest state.
- Give the order status page a vertical timeline per preparation step
  (with a distinct customer-facing name separate from the machine tag,
  a done/in-progress/queued/pending look, and a sonar-ping highlight on
  the active step), a formatted ETA (relative under 3h, absolute clock
  time beyond that), and Buy again / Get help / Cancel actions.
- Expand Pizza's recipe into 6 steps across a shared prep station and
  the existing oven/assembly stations, with matching schema, seed, and
  domain changes plus updated/added test coverage.
- Add an Orders list (account orders via session, guest orders via a
  locally remembered access-token list) with a shared getOrdersForCustomer
  domain summary, and remember a guest's name/contact after their first
  order so checkout doesn't ask again.
- Improve page transitions with the View Transitions API: a shared
  element morph between an order card and its detail page, a stable
  (non-jumping) header across navigations, and reduced-motion handling.
- Add a Ghost Kitchen wordmark (Space Grotesk, faded "Ghost", ghost
  icon standing in for the "o") and shrink the basket icon to match
  the rest of the header controls.
- Add a run-ghost-kitchen agent skill documenting local setup, the
  dev-server driver, and the gotchas hit along the way.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/lib/format.ts

@@ -0,0 +1,31 @@
+export const formatDuration = (totalSeconds: number) => {
+  const totalMinutes = Math.max(1, Math.ceil(totalSeconds / 60))
+  const hours = Math.floor(totalMinutes / 60)
+  const minutes = totalMinutes % 60
+
+  if (hours === 0) return `${minutes} min`
+  if (minutes === 0) return `${hours} hr`
+  return `${hours} hr ${minutes} min`
+}
+
+const startOfDay = (date: Date) =>
+  new Date(date.getFullYear(), date.getMonth(), date.getDate())
+
+export const formatEtaClock = (etaSeconds: number, now = new Date()) => {
+  const target = new Date(now.getTime() + etaSeconds * 1000)
+  const time = target.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
+  const dayDiff = Math.round(
+    (startOfDay(target).getTime() - startOfDay(now).getTime()) / 86_400_000,
+  )
+
+  if (dayDiff === 0) return `today, ${time}`
+  if (dayDiff === 1) return `tomorrow, ${time}`
+  return `${target.toLocaleDateString([], { weekday: 'long' })}, ${time}`
+}
+
+const ABSOLUTE_TIME_THRESHOLD_SECONDS = 3 * 60 * 60
+
+export const formatEtaMessage = (etaSeconds: number, now = new Date()) =>
+  etaSeconds > ABSOLUTE_TIME_THRESHOLD_SECONDS
+    ? `Ready ${formatEtaClock(etaSeconds, now)}`
+    : `Ready in about ${formatDuration(etaSeconds)}`