Fix cart-mini home link: use coop_url instead of broken qs|host filter

The |qs filter returns "" when makeqs_factory is not set (events app),
causing |host to generate the events app root URL which has no route.

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

browser/templates/_types/cart/_mini.html

@@ -14,7 +14,7 @@
   {% if _count == 0 %}
   <div class="h-12 w-12 rounded-full overflow-hidden border border-stone-300 flex-shrink-0">
     <a
-      href="{{ {'clear_filters': True}|qs|host }}"
+      href="{{ coop_url('/') }}"
       class="h-full w-full font-bold text-5xl flex-shrink-0 flex flex-row items-center gap-1"
     >
       <img