feat(sw): pass audio fetches through to the network

CHANGELOG.md

@@ -87,6 +87,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   session cookie. Drops the WebSocket-embedded base64 path, fixing
   Mobile Edge AAC playback and dramatically reducing per-call memory
   pressure on the client.
+- Service worker now passes audio fetches (`/api/calls/:id/audio` and
+  `/api/shared/:token/audio`) straight through to the network instead of
+  intercepting them. Lets the browser handle Range requests natively for
+  the `<audio>` element and avoids buffering full call bodies in the
+  worker.
 
 ### Fixed
 

frontend/sw.ts

@@ -29,6 +29,17 @@ sw.addEventListener("fetch", (event) => {
   const { request } = event;
   const url = new URL(request.url);
 
+  // Pass through audio downloads untouched. Letting the SW intercept
+  // these would force-buffer the full body in memory and strip the
+  // browser's native Range-request handling that <audio> relies on.
+  // Matches /api/calls/:id/audio and /api/shared/:token/audio.
+  if (
+    /^\/api\/calls\/\d+\/audio$/.test(url.pathname) ||
+    /^\/api\/shared\/[^/]+\/audio$/.test(url.pathname)
+  ) {
+    return;
+  }
+
   // Network-first for API calls
   if (url.pathname.startsWith("/api")) {
     event.respondWith(