Fix: update local _nav.html to use widget-driven nav

The blog app's local templates/_types/post/_nav.html was shadowing
the shared version due to ChoiceLoader priority. Updated local copy
to use container_nav_widgets while keeping the blog-specific admin
cog link. Removed debug logging from context processor.

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

bp/post/routes.py

@@ -70,10 +70,6 @@ def register():
           post_slug = (g.post_data.get("post") or {}).get("slug", "")
 
           # Widget-driven container nav
-          import logging
-          _log = logging.getLogger("coop")
-          _log.warning("WIDGET DEBUG: %d nav widgets registered, post_id=%s slug=%s",
-                       len(widgets.container_nav), db_post_id, post_slug)
           container_nav_loaded = []
           for w in widgets.container_nav:
               try:
@@ -82,12 +78,9 @@ def register():
                       post_slug=post_slug,
                   )
                   has_data = any(v for v in wctx.values() if isinstance(v, list) and v)
-                  _log.warning("WIDGET DEBUG: %s has_data=%s keys=%s", w.domain, has_data,
-                               {k: len(v) if isinstance(v, list) else v for k, v in wctx.items()})
                   if has_data:
                       container_nav_loaded.append({"widget": w, "ctx": wctx})
-              except Exception as e:
-                  _log.exception("WIDGET ERROR: %s: %s", w.domain, e)
+              except Exception:
 
           ctx = {
               **p_data,