Fixes #20009: Fix DOM-based XSS vulnerability in search export functionality

Replace direct string concatenation with URLSearchParams to properly
encode user input in export link URLs, preventing injection of malicious
parameters or scripts through the search functionality.

Resolves CodeQL Alert #63 (js/xss-through-dom)

netbox/project-static/src/search.ts

@@ -38,7 +38,9 @@ function handleQuickSearchParams(event: Event): void {
 
   if (quickSearchParameters != null) {
     const link = document.getElementById('export_current_view') as HTMLLinkElement;
-    const search_parameter = `q=${quickSearchParameters.value}`;
+    const params = new URLSearchParams();
+    params.set('q', quickSearchParameters.value);
+    const search_parameter = params.toString();
     const linkUpdated = link?.href + '&' + search_parameter;
     link.setAttribute('href', linkUpdated);
   }