guest role; guide section ticking

plugins/guides/services/blocks.py

@@ -124,11 +124,21 @@ def plaintext(blocks):
 
 
 def checklistitemcount(blocks):
-    """How many tickable items a guide has, for the list and the progress bar."""
+    """How many tickable things a guide has, for the card and the progress bar.
+
+    Checklist items, plus the sections a reader crosses off to keep their place:
+    a step, or a heading. A guide converted from an article often has fifty
+    headings and no steps at all, and "0 steps to tick" on a card that is
+    entirely tickable reads as a broken feature.
+    """
     total = 0
     for block in blocks or []:
-        if isinstance(block, dict) and block.get('type') == 'checklist':
+        if not isinstance(block, dict):
+            continue
+        if block.get('type') == 'checklist':
             total += len(block.get('items') or [])
+        elif block.get('type') in ('step', 'heading'):
+            total += 1
     return total