Fix comment count being broken for first comment

Client/app/routes/post.tsx

@@ -213,7 +213,7 @@ export default function Post() {
 
 
   const onAddComment = async (postId: number, commentText: string) => {
-    if (!user || !paginatedComments) return;
+    if (!user) return;
     const res = await API.postComment(postId, commentText, user);
     if (!res.ok) {
       alert("Failed to add comment");
@@ -221,6 +221,14 @@ export default function Post() {
     }
     const newComment: Comment = await res.json();
 
+    // Refetch comments if this is the first one.
+    if (!paginatedComments || paginatedComments.totalCount === 0) {
+      const comments = await API.fetchCommentsByPostId(idNum, 1);
+      setPaginatedComments(comments);
+      setCurrentCommentPage(1);
+      return;
+    }
+    
     const totalPages = Math.ceil((paginatedComments.totalCount + 1) / paginatedComments.pageSize);
     if (currentCommentPage !== totalPages) {
       setCurrentCommentPage(totalPages);
@@ -232,7 +240,7 @@ export default function Post() {
           return {
             ...prev,
             items: [...prev.items, newComment],
-            total: prev.totalCount + 1
+            totalCount: prev.totalCount + 1
           };
         } else {
           // This case is unlikely if totalPages is calculated correctly, but as a fallback, we refetch.
@@ -259,10 +267,13 @@ export default function Post() {
     setPaginatedComments(prev => {
       if (!prev) return null;
       const newItems = prev.items.filter(c => c.id !== commentId);
+      const newTotalCount = prev.totalCount - 1;
+
       if (newItems.length === 0 && currentCommentPage > 1) {
         setCurrentCommentPage(currentCommentPage - 1);
+        return { ...prev, items: newItems, totalCount: newTotalCount };
       }
-      return { ...prev, items: newItems, total: prev.totalCount - 1 };
+      return { ...prev, items: newItems, totalCount: newTotalCount };
     });
   };