fix: make storefront API referer extraction platform-aware and fix script loading

Two bugs causing "Program Not Available" on storefront enrollment:

1. extract_store_from_referer() was not platform-aware — used
   settings.main_domain (wizard.lu) instead of platform.domain
   (rewardflow.lu) for subdomain detection, and restricted path-based
   extraction to localhost only. Now mirrors the platform-aware logic
   from _detect_store_from_host_and_path(): checks platform.domain for
   subdomain detection (fashionhub.rewardflow.lu → fashionhub) and
   allows path-based extraction on platform domains
   (rewardflow.lu/storefront/FASHIONHUB/... → FASHIONHUB).

2. Storefront JS scripts (enroll, dashboard, history) were missing
   defer attribute, causing them to execute before log-config.js and
   crash on window.LogConfig access. Also fix quote escaping in
   server-side rendered x-text expressions for French translations.

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

app/modules/loyalty/templates/loyalty/storefront/dashboard.html

@@ -230,5 +230,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-dashboard.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-dashboard.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/storefront/enroll.html

@@ -119,7 +119,7 @@
                         class="w-full py-3 px-4 text-white font-semibold rounded-lg transition-colors disabled:opacity-50"
                         :style="'background-color: ' + (program?.card_color || 'var(--color-primary)')">
                     <span x-show="enrolling" x-html="$icon('spinner', 'w-5 h-5 inline animate-spin mr-2')"></span>
-                    <span x-text="enrolling ? '{{ _('loyalty.enrollment.form.joining') }}' : '{{ _('loyalty.enrollment.form.join_button', points=program.welcome_bonus_points if program else 0) }}'"></span>
+                    <span x-text="enrolling ? '{{ _('loyalty.enrollment.form.joining')|replace("'", "\\'") }}' : '{{ _('loyalty.enrollment.form.join_button', points=program.welcome_bonus_points if program else 0)|replace("'", "\\'") }}'"></span>
                 </button>
             </form>
 
@@ -170,5 +170,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-enroll.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-enroll.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/storefront/history.html

@@ -105,5 +105,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-history.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-history.js') }}"></script>
 {% endblock %}