fix(map): show developed photos for the sample album too

The scrapbook only treated the store as 'live' when it held an upload (id prefix
'u'), so the 'Try a sample album' photos (ids 'p1'..'p4') were ignored and the
map fell back to the hardcoded demo moments — i.e. the originals, even after the
watercolour develop wrote back. Since the store now starts empty, any photo in
it is user-loaded, so switch the gate to 'store has any photo' and only fall
back to the demo when it's genuinely empty.

index.html

@@ -6098,10 +6098,11 @@
       const setSelectedId = (v) => { setSelectedIdRaw(v); Collab.send("selection", { value: v }); };
       const current = MAP_VARIANTS.find((v) => v.id === variant) || MAP_VARIANTS[0];
       const storePhotos = usePhotos();
-      // Switch to live store data only when the user has uploaded at least one
-      // photo beyond the seeded demos (id prefix "u"). Fall back to the curated
-      // Ottawa moments so the scrapbook layout looks right out of the box.
-      const hasUserPhotos = storePhotos.some((p) => String(p.id).startsWith("u"));
+      // The store starts EMPTY, so any photo in it was loaded by the user -
+      // whether uploaded ("u" ids) or from the sample album ("p" ids). Only fall
+      // back to the curated demo moments when the store is genuinely empty, so
+      // developed watercolours always carry through to the map.
+      const hasUserPhotos = storePhotos.some((p) => p && p.src);
       const liveMoments = hasUserPhotos ? storePhotos.map(storeToMoment) : moments;
       return (
         <section className="flex w-full max-w-7xl flex-col overflow-hidden rounded-xl border-2 border-primary bg-card shadow-lg sm:flex-row">