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/guestIdentity.ts

@@ -0,0 +1,39 @@
+// A guest's name/contact, remembered locally so checkout doesn't ask again
+// on their next order from this browser.
+const STORAGE_KEY = 'ghost-kitchen-guest-identity'
+
+export type GuestIdentity = { name: string; contact: string }
+
+const isGuestIdentity = (value: unknown): value is GuestIdentity =>
+  typeof value === 'object' &&
+  value !== null &&
+  typeof (value as GuestIdentity).name === 'string' &&
+  typeof (value as GuestIdentity).contact === 'string'
+
+export const getGuestIdentity = (): GuestIdentity | null => {
+  try {
+    const raw = window.localStorage.getItem(STORAGE_KEY)
+    if (!raw) return null
+    const parsed: unknown = JSON.parse(raw)
+    return isGuestIdentity(parsed) ? parsed : null
+  } catch {
+    return null
+  }
+}
+
+export const saveGuestIdentity = (identity: GuestIdentity) => {
+  try {
+    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(identity))
+  } catch {
+    // Unavailable (private mode, quota) — checkout still works, it just
+    // asks again next time.
+  }
+}
+
+export const clearGuestIdentity = () => {
+  try {
+    window.localStorage.removeItem(STORAGE_KEY)
+  } catch {
+    // Unavailable — nothing to clear.
+  }
+}