copy link buttons for item detail and forum post

frontend/src/pages/ForumPostDetail.tsx

@@ -222,6 +222,16 @@ const ForumPostDetail: React.FC = () => {
     setDeletionReason('');
   };
 
+  const handleCopyLink = async () => {
+    const shareUrl = `${window.location.origin}/forum/${post?.id}`;
+
+    try {
+      await navigator.clipboard.writeText(shareUrl);
+    } catch (err) {
+      console.error("Copy to clipboard failed:", err);
+    }
+  };
+
   const formatDate = (dateString: string) => {
     const date = new Date(dateString);
     return date.toLocaleString(undefined, {
@@ -292,7 +302,17 @@ const ForumPostDetail: React.FC = () => {
                   Pinned
                 </span>
               )}
-              <h1 className="h3 mb-2">{post.title}</h1>
+              <div className="d-flex align-items-center justify-content-between mb-2">
+                <h1 className="h3 mb-0">{post.title}</h1>
+                <button
+                  className="btn btn-outline-secondary btn-sm"
+                  onClick={handleCopyLink}
+                  aria-label="Copy link to this post"
+                >
+                  <i className="bi bi-link-45deg me-2"></i>
+                  Copy Link
+                </button>
+              </div>
 
               <div className="d-flex gap-2 mb-2 flex-wrap">
                 <div className="d-flex gap-2">