feat: add Service Worker registration utility for GitHub Pages

Author: kevinleonsmith

src/registerSW.ts

@@ -0,0 +1,13 @@
+// Service Worker registration
+export async function registerServiceWorker() {
+  if ('serviceWorker' in navigator) {
+    try {
+      const registration = await navigator.serviceWorker.register(new URL('/HarborStack/sw.js', import.meta.url), {
+        scope: '/HarborStack/'
+      });
+      console.log('✅ Service Worker registered:', registration);
+    } catch (error) {
+      console.warn('⚠️ Service Worker registration failed:', error);
+    }
+  }
+}