fix: add chevron-double icons and fix subscriptions pagination

- Add chevron-double-left and chevron-double-right icons to icons.js
- Switch subscriptions page from pagination_full to pagination macro
  (pagination_full expects flat variables but component uses nested pagination object)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/admin/subscriptions.html

@@ -3,7 +3,7 @@
 {% from 'shared/macros/alerts.html' import alert_dynamic, error_state %}
 {% from 'shared/macros/headers.html' import page_header_refresh %}
 {% from 'shared/macros/tables.html' import table_wrapper, table_header_custom, th_sortable %}
-{% from 'shared/macros/pagination.html' import pagination_full %}
+{% from 'shared/macros/pagination.html' import pagination %}
 
 {% block title %}Vendor Subscriptions{% endblock %}
 
@@ -225,7 +225,7 @@
 {% endcall %}
 
 <!-- Pagination -->
-{{ pagination_full() }}
+{{ pagination(show_condition="!loading && pagination.total > 0") }}
 
 <!-- Edit Modal -->
 {# noqa: FE-004 - Inline modal required for complex subscription edit form #}