Fix home route: build full post context for template rendering

The post template needs context (base_title, container_nav_widgets,
page_cart_count) that the post blueprint's context_processor provides.
Since home() runs on the blog blueprint, it must build this context
itself.

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

bp/blog/routes.py

@@ -82,6 +82,10 @@ def register(url_prefix, title):
     async def home():
       """Render the Ghost page with slug 'home' as the site homepage."""
       from ..post.services.post_data import post_data as _post_data
+      from shared.config import config as get_config
+      from shared.infrastructure.cart_identity import current_cart_identity
+      from shared.services.registry import services as svc
+      from shared.services.widget_registry import widgets
 
       p_data = await _post_data("home", g.s, include_drafts=False)
       if not p_data:
@@ -89,10 +93,44 @@ def register(url_prefix, title):
           return redirect(host_url(url_for("blog.index")))
 
       g.post_data = p_data
+
+      # Build the same context the post blueprint's context_processor provides
+      db_post_id = p_data["post"]["id"]
+      post_slug = p_data["post"]["slug"]
+
+      container_nav_loaded = []
+      for w in widgets.container_nav:
+          try:
+              wctx = await w.context_fn(
+                  g.s, container_type="page", container_id=db_post_id,
+                  post_slug=post_slug,
+              )
+              has_data = any(v for v in wctx.values() if isinstance(v, list) and v)
+              if has_data:
+                  container_nav_loaded.append({"widget": w, "ctx": wctx})
+          except Exception:
+              pass
+
+      ctx = {
+          **p_data,
+          "base_title": f"{get_config()['title']} {p_data['post']['title']}",
+          "container_nav_widgets": container_nav_loaded,
+      }
+
+      # Page cart badge
+      if p_data["post"].get("is_page"):
+          ident = current_cart_identity()
+          page_summary = await svc.cart.cart_summary(
+              g.s, user_id=ident["user_id"], session_id=ident["session_id"],
+              page_slug=post_slug,
+          )
+          ctx["page_cart_count"] = page_summary.count + page_summary.calendar_count + page_summary.ticket_count
+          ctx["page_cart_total"] = float(page_summary.total + page_summary.calendar_total + page_summary.ticket_total)
+
       if not is_htmx_request():
-          html = await render_template("_types/post/index.html", **p_data)
+          html = await render_template("_types/post/index.html", **ctx)
       else:
-          html = await render_template("_types/post/_oob_elements.html", **p_data)
+          html = await render_template("_types/post/_oob_elements.html", **ctx)
       return await make_response(html)
 
     @blogs_bp.get("/index")