feat(ui): add thank you page and update wedding party section

* Introduce a new thank you page with a list of acknowledgments.
* Enhance the wedding party section with photos and improved layout.
* Update welcome messages for clarity and consistency.

ui/src/routes/thanks/+page.svelte

@@ -0,0 +1,49 @@
+<script lang="ts">
+  import PhotoBackground from "$lib/components/PhotoBackground.svelte";
+
+  const thanks = [
+    { name: "Gayle Muller-Lombard", role: "Mother of the Bride" },
+    { name: "Jan Lombard", role: "Stepdad of the Bride" },
+    { name: "Vera Muller", role: "Grandmother of the Bride" },
+    { name: "Christian Els", role: "Cousin of the Bride" },
+    { name: "Divan Swart", role: "Father of the Bride" },
+    { name: "Louis Pietser", role: "Father of the Groom" },
+    { name: "Dezelle Ras", role: "Friend" },
+    { name: "Cindy Berriman-Puth", role: "Friend" },
+    { name: "Hein Puth (Warky Devs)", role: "Website & Friend" },
+    { name: "Ronel Gous", role: "Ronel Events and Designs & Friend" },
+    { name: "Monica", role: "Rivier Plaas Wedding Venue" },
+  ];
+</script>
+
+<section
+  class="relative flex flex-1 items-center justify-center overflow-hidden px-4 py-16 z-10"
+>
+  <PhotoBackground />
+
+  <div
+    class="border-surface-50/70 text-shadow-sm text-shadow-black/60 relative z-10 w-full max-w-md border px-6 py-12 sm:px-14 sm:py-16"
+  >
+    <h1 class="text-surface-50 font-serif text-4xl">
+      A Special Note of Thanks
+    </h1>
+    <p class="text-surface-100 mt-2 text-2xl">
+      To some very special people in our lives who have helped us make our day
+      magical:
+    </p>
+    <ul class="mt-4 flex flex-col gap-2">
+      {#each thanks as person (person.name)}
+        <li
+          class="border-surface-50/30 flex items-center justify-between border-b py-2"
+        >
+          <span class="text-surface-50 text-2xl">{person.name}</span>
+          <span class="text-secondary-300 text-lg">{person.role}</span>
+        </li>
+      {/each}
+    </ul>
+    <p class="text-surface-100 mt-6 text-xl">
+      If there is anyone we have forgotten about, please know that you are all
+      special to us!
+    </p>
+  </div>
+</section>