fix(loyalty): align menu item IDs with URL segments for sidebar highlight

The store and merchant init-alpine.js derive currentPage from the URL's
last segment (e.g., /loyalty/program -> 'program'). Loyalty menu items
used prefixed IDs like 'loyalty-program' which never matched, so sidebar
items never highlighted.

Fixed by renaming all store/merchant menu item IDs and JS currentPage
values to match URL segments: program, cards, analytics, transactions,
pins, settings — consistent with how every other module works.

Also reverted the init-alpine.js guard that broke storeCode extraction,
and added missing loyalty.common.contact_admin_setup translation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/core/static/store/js/init-alpine.js

@@ -65,16 +65,14 @@ function data() {
         openSections: getStoreSidebarSectionsFromStorage(),
 
         init() {
-            // Set current page from URL (only if not already set by child component)
-            if (!this.currentPage) {
-                const path = window.location.pathname;
-                const segments = path.split('/').filter(Boolean);
-                // For /store/ABC/orders/123 -> 'orders' (skip numeric IDs)
-                const last = segments[segments.length - 1] || 'dashboard';
-                this.currentPage = /^\d+$/.test(last) && segments.length > 2
-                    ? segments[segments.length - 2]
-                    : last;
-            }
+            // Set current page from URL
+            const path = window.location.pathname;
+            const segments = path.split('/').filter(Boolean);
+            // For /store/ABC/orders/123 -> 'orders' (skip numeric IDs)
+            const last = segments[segments.length - 1] || 'dashboard';
+            this.currentPage = /^\d+$/.test(last) && segments.length > 2
+                ? segments[segments.length - 2]
+                : last;
 
             // Get store code from server-rendered value or URL fallback
             this.storeCode = window.STORE_CODE || null;