fix(pwa): guarantee service worker registration on readyState and head script for WebAPK minting

src/app/layout.tsx

@@ -45,6 +45,15 @@ export default function RootLayout({
         <script
           dangerouslySetInnerHTML={{
             __html: `
+              if ('serviceWorker' in navigator) {
+                navigator.serviceWorker.register('/sw.js', { scope: '/' })
+                  .then(function(reg) {
+                    console.log('[Everclone PWA] Early SW registered, scope:', reg.scope);
+                  })
+                  .catch(function(err) {
+                    console.warn('[Everclone PWA] Early SW registration failed:', err);
+                  });
+              }
               window.__everclone_install_prompt = null;
               window.addEventListener('beforeinstallprompt', function(e) {
                 e.preventDefault();