Add oob context processor to orders blueprint for full-page rendering

The orders/index.html template extends auth/index.html which needs
the oob dict for template inheritance. Without it, direct navigation
to /orders/ fails with "'oob' is undefined".

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

bp/orders/routes.py

@@ -25,6 +25,18 @@ def register(url_prefix: str) -> Blueprint:
     )
     ORDERS_PER_PAGE = 10  # keep in sync with browse page size / your preference
 
+    oob = {
+        "extends": "_types/root/_index.html",
+        "child_id": "auth-header-child",
+        "header": "_types/auth/header/_header.html",
+        "nav": "_types/auth/_nav.html",
+        "main": "_types/auth/_main_panel.html",
+    }
+
+    @bp.context_processor
+    def inject_oob():
+        return {"oob": oob}
+
     @bp.before_request
     def route():
         # this is the crucial bit for the |qs filter