Add Art-DAG to coop nav-tree fragment

Append synthetic artdag nav entry to blog's nav-tree handler so
Art-DAG appears in the shared navigation across all 6 coop apps.
Register artdag_url as Jinja global.

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

blog/bp/fragments/routes.py

@@ -36,7 +36,18 @@ def register():
         app_name = request.args.get("app_name", "")
         path = request.args.get("path", "/")
         first_seg = path.strip("/").split("/")[0]
-        menu_items = await get_navigation_tree(g.s)
+        menu_items = list(await get_navigation_tree(g.s))
+
+        # Append Art-DAG as a synthetic nav entry (not a DB MenuNode)
+        class _NavItem:
+            __slots__ = ("slug", "label", "feature_image")
+            def __init__(self, slug, label, feature_image=None):
+                self.slug = slug
+                self.label = label
+                self.feature_image = feature_image
+
+        menu_items.append(_NavItem("artdag", "art-dag"))
+
         return await render_template(
             "fragments/nav_tree.html",
             menu_items=menu_items,

blog/templates/fragments/nav_tree.html

@@ -8,6 +8,7 @@
   'events': events_url('/'),
   'federation': federation_url('/'),
   'account': account_url('/'),
+  'artdag': artdag_url('/'),
 } %}
 <div class="flex flex-col sm:flex-row sm:items-center gap-2 border-r border-stone-200 mr-2 sm:max-w-2xl"
      id="menu-items-nav-wrapper">

shared/infrastructure/jinja_setup.py

@@ -13,7 +13,7 @@ from shared.browser.app.csrf import generate_csrf_token
 from shared.browser.app.authz import has_access
 from shared.browser.app.filters import register as register_filters
 
-from .urls import blog_url, market_url, cart_url, events_url, federation_url, account_url, login_url, page_cart_url, market_product_url
+from .urls import blog_url, market_url, cart_url, events_url, federation_url, account_url, artdag_url, login_url, page_cart_url, market_product_url
 
 
 def setup_jinja(app: Quart) -> None:
@@ -99,6 +99,7 @@ def setup_jinja(app: Quart) -> None:
     app.jinja_env.globals["events_url"] = events_url
     app.jinja_env.globals["federation_url"] = federation_url
     app.jinja_env.globals["account_url"] = account_url
+    app.jinja_env.globals["artdag_url"] = artdag_url
     app.jinja_env.globals["login_url"] = login_url
     app.jinja_env.globals["page_cart_url"] = page_cart_url
     app.jinja_env.globals["market_product_url"] = market_product_url