Fix: Add Alpine.js for expandable abstracts

- Add Alpine.js CDN script for expand/collapse functionality
- Add x-cloak CSS to hide content until Alpine loads
- Fix footer dataset link to point to correct repo

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/base.html

@@ -11,7 +11,12 @@
     <!-- HTMX -->
     <script src="https://unpkg.com/htmx.org@1.9.12"></script>
 
+    <!-- Alpine.js (for expand/collapse) -->
+    <script defer src="https://unpkg.com/alpinejs@3.x.x/dist/cdn.min.js"></script>
+
     <style>
+        /* Alpine.js cloak (hide until loaded) */
+        [x-cloak] { display: none !important; }
         /* Loading indicator - subtle */
         .htmx-indicator { display: none; }
         .htmx-request .htmx-indicator,
@@ -35,7 +40,7 @@
 
     <footer class="border-t border-gray-100 mt-12">
         <div class="max-w-3xl mx-auto px-4 py-4 text-gray-400 text-xs">
-            <a href="https://huggingface.co/datasets/davanstrien/my-classified-papers" class="hover:text-gray-600">Data source</a>
+            <a href="https://huggingface.co/datasets/librarian-bots/arxiv-cs-papers-lance" class="hover:text-gray-600">Data source</a>
             <span class="mx-2">·</span>
             <a href="https://huggingface.co/davanstrien/ModernBERT-base-is-new-arxiv-dataset" class="hover:text-gray-600">Model</a>
         </div>