fix(theme): blog posts no longer fade out; readable post layout

- Scroll reveal used threshold 0.15: a section taller than ~6.7 screens (a
  long article) never reached it, so after the reveal class hid it, it
  stayed hidden. Reveal as soon as any part enters (threshold 0).
- Post header: full-width title with meta below and a normal gap
- Article: heading sizes per level, photos keep their shape (no crop),
  icon-sized inline SVGs, full-width embeds
- Strip the imported 'Home' breadcrumb line from posts and card excerpts
- Theme 1.0.15

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

astra-child-hoponhopoff/assets/pages.js

@@ -168,7 +168,9 @@
         });
         obs.unobserve(entry.target);
       });
-    }, { threshold: 0.15, rootMargin: '0px 0px -8% 0px' });
+    // threshold 0, not a ratio: a section taller than the screen (a long
+    // article) can never be 15% visible and would stay hidden forever.
+    }, { threshold: 0, rootMargin: '0px 0px -8% 0px' });
 
     sections.forEach(function (section) { revealObserver.observe(section); });
   }