fix: robust lesson parsing for flexible home.md formats

generate_tokens.py

@@ -27,15 +27,17 @@ def get_lesson_names():
         with open(home_file_path, 'r', encoding='utf-8') as f:
             content = f.read()
 
-        parts = content.split('---Available_Lessons---')
+        # Use robust regex to split Available_Lessons
+        parts = re.split(r'-{3,}Available_Lessons-{3,}', content)
         if len(parts) > 1:
             lesson_list_content = parts[1]
+            # Allow optional leading slash in /lesson/ prefix
             lesson_links = re.findall(
-                r'\[([^\]]+)\]\(lesson/([^\)]+)\)', lesson_list_content
+                r'\[([^\]]+)\]\((?:/?lesson/)?([^\)]+)\)', lesson_list_content
             )
             if lesson_links:
-                for _link_text, filename in lesson_links:
-                    lesson_names.append(filename.replace('.md', ''))
+                for _link_text, slug in lesson_links:
+                    lesson_names.append(slug.replace('.md', ''))
                 return lesson_names
 
     # Fallback: alphabetical order

services/lesson_service.py

@@ -29,7 +29,8 @@ def _parse_lesson_links(home_content):
         return []
     lesson_list_content = parts[-1]
     
-    links = re.findall(r'\[([^\]]+)\]\((?:/lesson/)?([^\)]+)\)', lesson_list_content)
+    # Allow optional leading slash in /lesson/ prefix
+    links = re.findall(r'\[([^\]]+)\]\((?:/?lesson/)?([^\)]+)\)', lesson_list_content)
     
     processed_links = []
     for title, slug in links:
@@ -582,6 +583,7 @@ def render_home_content():
     if not home_content:
         return ""
 
-    parts = home_content.split('---Available_Lessons---')
+    # Use robust regex to split Available_Lessons
+    parts = re.split(r'-{3,}Available_Lessons-{3,}', home_content)
     main_content = parts[0] if parts else home_content
     return md.markdown(main_content, extensions=['fenced_code', 'tables', 'mdx_math'])