fix regex in chapters

platogram/cli.py

@@ -230,7 +230,7 @@ def get_chapter(passage_marker: int) -> int | None:
             if args.chapters:
                 current_chapter = None
                 for passage in content.passages:
-                    passage_markers = [int(m) for m in re.findall(r"\d+", passage)]
+                    passage_markers = [int(m) for m in re.findall(r"【(\d+)】", passage)]
                     chapter_marker = get_chapter(passage_markers[0])
                     if chapter_marker is not None and chapter_marker != current_chapter:
                         passages += f"### {content.chapters[chapter_marker]}\n\n"