fix(core): don't overwrite currentPage set by child Alpine components

The store init-alpine.js init() was unconditionally setting currentPage
from the URL path segment, overwriting the value set by child components
like storeLoyaltyProgram (currentPage: 'loyalty-program'). This caused
sidebar menu items to not highlight on pages where the URL segment
doesn't match the menu item ID (e.g., /loyalty/program vs loyalty-program).

Now only sets currentPage from URL if the child hasn't already set it.

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

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

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