second to last commit hopefully final features and Ui refinements

src/lib/stores/stampsStore.js

@@ -0,0 +1,9 @@
+import { writable } from 'svelte/store';
+
+// Holds this device/user's earned "passport stamps" (see firebase/stamps.js).
+// Populated by getStamps() on load and appended to live by
+// checkAndAwardStamp() whenever a new stamp is earned, so the bottom-nav
+// (mobile) and stamp-book button (desktop) in +page.svelte can react to
+// $stampsStore.length to switch between their empty/filled icon states
+// without needing a refetch.
+export const stampsStore = writable([]);