refactor(ui): remove duplicate bookmark title and heading

- Remove bookmark title (h3) from bookmark items
- Remove duplicate h4 heading from individual-bookmarks section
- Keep only the single 'X bookmarks in this list:' line with event link

src/components/BookmarkList.tsx

@@ -55,7 +55,6 @@ export const BookmarkList: React.FC<BookmarkListProps> = ({
         <div className="bookmarks-list">
           {bookmarks.map((bookmark, index) => (
             <div key={`${bookmark.id}-${index}`} className="bookmark-item">
-              <h3>{bookmark.title}</h3>
               {bookmark.bookmarkCount && (
                 <p className="bookmark-count">
                   {bookmark.bookmarkCount} bookmarks in{' '}
@@ -82,18 +81,6 @@ export const BookmarkList: React.FC<BookmarkListProps> = ({
               )}
               {bookmark.individualBookmarks && bookmark.individualBookmarks.length > 0 && (
                 <div className="individual-bookmarks">
-                  <h4>
-                    {bookmark.individualBookmarks.length} bookmarks in{' '}
-                    <a 
-                      href={`https://search.dergigi.com/e/${bookmark.id}`}
-                      target="_blank"
-                      rel="noopener noreferrer"
-                      className="event-link"
-                    >
-                      this list
-                    </a>
-                    :
-                  </h4>
                   <div className="bookmarks-grid">
                     {bookmark.individualBookmarks.map((individualBookmark, index) => 
                       <BookmarkItem key={index} bookmark={individualBookmark} index={index} onSelectUrl={onSelectUrl} />