fix: comment deletion targets the clicked comment span, not cursor selection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/index.html

@@ -1844,10 +1844,25 @@ function closeCommentPopup() {
 
 function deleteComment() {
   if (!tiptapEditor || !activeCommentMark) return;
-  // Find the position of this mark in the editor and remove it
+  // Find the position of this comment span in the document
-  tiptapEditor.chain().focus().unsetMark('comment').run();
+  const commentText = activeCommentMark.getAttribute('data-comment');
+  const commentDate = activeCommentMark.getAttribute('data-date');
+  const doc = tiptapEditor.state.doc;
+  let markFrom = null, markTo = null;
+  doc.descendants((node, pos) => {
+    if (markFrom !== null) return false;
+    if (node.isText) {
+      const mark = node.marks.find(m => m.type.name === 'comment' && m.attrs.text === commentText && m.attrs.date === commentDate);
+      if (mark) {
+        markFrom = pos;
+        markTo = pos + node.nodeSize;
+      }
+    }
+  });
+  if (markFrom !== null) {
+    tiptapEditor.chain().focus().setTextSelection({ from: markFrom, to: markTo }).unsetMark('comment').run();
+  }
   closeCommentPopup();
-  // Trigger save
   clearTimeout(saveTimeout);
   saveTimeout = setTimeout(saveContent, 500);
 }