fix(giscus): revert to built-in dark theme

Remove custom CSS theme, worker script, and custom Comments header.
Use Giscus built-in dark theme instead due to CORS issues.

Author: CalvinAllen

public/_headers

@@ -79,7 +79,6 @@ const ogImageUrl = image?.src;
       )}
 
       <section class="mt-8">
-        <h2 class="text-2xl font-heading mb-6">Comments <span id="comment-count" class="text-text-muted text-lg font-normal"></span></h2>
         <script
           src="https://giscus.app/client.js"
           data-repo="CodingWithCalvin/codingwithcalvin.net"
@@ -89,33 +88,14 @@ const ogImageUrl = image?.src;
           data-mapping="og:title"
           data-strict="1"
           data-reactions-enabled="0"
-          data-emit-metadata="1"
+          data-emit-metadata="0"
           data-input-position="top"
-          data-theme="https://www.codingwithcalvin.net/giscus-theme.css"
+          data-theme="dark"
           data-lang="en"
           data-loading="lazy"
           crossorigin="anonymous"
           async
         ></script>
-        <script>
-          function handleGiscusMessage(event) {
-            if (!(typeof event.data === 'object' && event.data.giscus)) return;
-
-            const giscusData = event.data.giscus;
-            const countEl = document.getElementById('comment-count');
-
-            if (giscusData.discussion) {
-              const count = giscusData.discussion.totalCommentCount;
-              if (countEl && count !== undefined) {
-                countEl.textContent = `(${count})`;
-              }
-            } else if (countEl) {
-              // No discussion yet = 0 comments
-              countEl.textContent = '(0)';
-            }
-          }
-          window.addEventListener('message', handleGiscusMessage);
-        </script>
       </section>
     </div>
   </article>

public/giscus-theme.css

@@ -1,7 +1,5 @@
 name = "codingwithcalvin-net"
 compatibility_date = "2024-12-01"
-main = "src/worker.ts"
 
 [assets]
 directory = "./dist"
-binding = "ASSETS"