dev: register the dev service worker as an ES module so it actually loads

vite-plugin-pwa's dev-sw.js imports workbox as a module; registering it
as a classic script failed with 'script evaluation failed', leaving the
dev client with no SW — authenticated media 401'd (broken images in every
dev screenshot) and SW notification routing was untestable. Production
sw.js is unaffected.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/index.tsx

@@ -33,7 +33,13 @@ if ('serviceWorker' in navigator) {
     pushSessionToSW(session?.baseUrl, session?.accessToken);
   };
 
-  navigator.serviceWorker.register(swUrl).then(sendSessionToSW);
+  // The dev worker is an ES module (it imports workbox), so it must be
+  // registered as one — otherwise "script evaluation failed" and the dev
+  // client has no SW: authenticated media 401s and notification clicks
+  // never route. Production sw.js is a classic bundled script.
+  navigator.serviceWorker
+    .register(swUrl, import.meta.env.MODE === 'production' ? undefined : { type: 'module' })
+    .then(sendSessionToSW);
   navigator.serviceWorker.ready.then(sendSessionToSW);
 
   navigator.serviceWorker.addEventListener('message', (ev) => {