Add page-local ticket adjust route that returns HX-Refresh

The cards were posting to tickets.adjust_quantity which returns the
entry detail buy form — wrong context for the page summary. New
page_summary.adjust_ticket route calls the service and returns
HX-Refresh: true so the whole listing refreshes with correct counts.

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

templates/_types/page_summary/_card.html

@@ -30,7 +30,7 @@
     {% if entry.ticket_price is not none %}
       <div class="shrink-0">
         {% set qty = pending_tickets.get(entry.id, 0) %}
-        {% set ticket_url = url_for('tickets.adjust_quantity') %}
+        {% set ticket_url = url_for('page_summary.adjust_ticket') %}
         <div class="flex items-center gap-2 text-sm">
           <span class="text-green-600 font-medium">&pound;{{ '%.2f'|format(entry.ticket_price) }}</span>
 

templates/_types/page_summary/_card_tile.html

@@ -32,7 +32,7 @@
       <span class="text-xs text-green-600 font-medium">&pound;{{ '%.2f'|format(entry.ticket_price) }}/ticket</span>
 
       {% set qty = pending_tickets.get(entry.id, 0) %}
-      {% set ticket_url = url_for('tickets.adjust_quantity') %}
+      {% set ticket_url = url_for('page_summary.adjust_ticket') %}
 
       {% if qty == 0 %}
         <form