feat(ui): enhance Countdown and layout components

* Improve Countdown component styling and structure
* Update layout to include responsive menu and background pattern
* Adjust PhotoBackground and page styles for better presentation
* Add damask pattern SVG for background use

ui/src/routes/+page.svelte

@@ -8,7 +8,7 @@
 </script>
 
 <section
-  class="relative flex flex-1 items-center justify-center overflow-hidden px-4 py-16 text-center"
+  class="relative flex flex-1 items-center justify-center overflow-hidden px-4 py-16 text-center z-10"
 >
   <PhotoBackground />