diff --git a/app.py b/app.py
index 7ace632..837338f 100644
--- a/app.py
+++ b/app.py
@@ -3,7 +3,7 @@ import path_setup  # noqa: F401  # adds shared/ to sys.path
 
 from pathlib import Path
 
-from quart import g, abort
+from quart import g, abort, request
 from jinja2 import FileSystemLoader, ChoiceLoader
 from sqlalchemy import select
 
@@ -17,20 +17,23 @@ async def market_context() -> dict:
     """
     Market app context processor.
 
-    - menu_items: direct DB query
+    - nav_tree_html: fetched from blog as fragment
     - cart_count/cart_total: via cart service (includes calendar entries)
     - cart: direct ORM query (templates need .product relationship)
     """
     from shared.infrastructure.context import base_context
-    from shared.services.navigation import get_navigation_tree
     from shared.services.registry import services
     from shared.infrastructure.cart_identity import current_cart_identity
+    from shared.infrastructure.fragments import fetch_fragment
     from shared.models.market import CartItem
     from sqlalchemy.orm import selectinload
 
     ctx = await base_context()
 
-    ctx["menu_items"] = await get_navigation_tree(g.s)
+    ctx["nav_tree_html"] = await fetch_fragment(
+        "blog", "nav-tree",
+        params={"app_name": "market", "path": request.path},
+    )
 
     ident = current_cart_identity()
 
diff --git a/shared b/shared
index 0d40dfa..7e650a0 160000
--- a/shared
+++ b/shared
@@ -1 +1 @@
-Subproject commit 0d40dfaeca7dbdc8adeaf7b071bfd9faccb74511
+Subproject commit 7e650a0ee3a61d56525cc9e298ed0c4194e780a4