Serve Swedish Piper voices from frontend origin

piper-worker.js

@@ -1,7 +1,20 @@
 import {TtsSession} from '@mintplex-labs/piper-tts-web';
+import {localPiperModelUrl} from './piper-model-routing.mjs';
 
 const VOICE_ID = 'sv_SE-nst-medium';
 const ASSET_ROOT = '/tts/piper-wasm-v1';
+const localFetch = self.fetch.bind(self);
+
+// The pinned TTS library uses a fixed Hugging Face URL. Keep its OPFS cache logic,
+// but serve every model/config request from this frontend origin instead.
+self.fetch = (resource, options) => {
+  const requestedUrl = resource instanceof Request ? resource.url : String(resource);
+  const localModelUrl = localPiperModelUrl(requestedUrl, self.location.origin);
+  if (!localModelUrl) return localFetch(resource, options);
+  const redirected = resource instanceof Request ? new Request(localModelUrl, resource) : localModelUrl;
+  return localFetch(redirected, options);
+};
+
 let sessionPromise;
 let inferenceQueue = Promise.resolve();