Translate transcripts with Opus-MT in a dedicated translation worker

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/build.ts

@@ -3,7 +3,8 @@
  *
  * Emits a self-contained `dist/`:
  *   1. `bun build src/index.html` → hashed app-shell assets
- *   2. inference worker bundle at the stable /inference.worker.js URL
+ *   2. inference + translate worker bundles at stable /inference.worker.js and
+ *      /translate.worker.js URLs
  *   3. manifest + icons + onnxruntime .wasm/.mjs (dist/ort/, offline inference)
  *   4. sw.js with the precache manifest + a content-hash version injected
  *
@@ -53,6 +54,15 @@ const workerBuild = await Bun.build({
 });
 const workerScript = await workerBuild.outputs[0]!.text();
 await Bun.write(join(DIST, "inference.worker.js"), workerScript);
+// Transcript-translation worker (D-WS4b), same mechanism.
+const translateWorkerBuild = await Bun.build({
+  entrypoints: [join(ROOT, "src/worker/translate.worker.ts")],
+  target: "browser",
+  format: "esm",
+  minify: true,
+});
+const translateWorkerScript = await translateWorkerBuild.outputs[0]!.text();
+await Bun.write(join(DIST, "translate.worker.js"), translateWorkerScript);
 
 // 3. Static PWA assets + onnxruntime wasm binaries (offline inference — the
 // worker loads them from /ort/ instead of the jsdelivr CDN). The manifest and
@@ -89,6 +99,7 @@ const precachePaths = precachePathsFromOutputs(
   shellBuild.outputs.map((output) => relative(DIST, output.path)),
   [
     "inference.worker.js",
+    "translate.worker.js",
     "manifest.webmanifest",
     ...ICON_SIZES.map((size) => `icons/icon-${size}.png`),
     ...fontFiles.map((name) => `fonts/${name}`),
@@ -98,7 +109,7 @@ const fontBytes = await Promise.all(
   fontFiles.map((name) => Bun.file(join(FONTS_DIR, name)).bytes()),
 );
 const version = Bun.hash(
-  JSON.stringify(precachePaths) + swSource + workerScript + fontBytes.map((b) => Bun.hash(b)).join(),
+  JSON.stringify(precachePaths) + swSource + workerScript + translateWorkerScript + fontBytes.map((b) => Bun.hash(b)).join(),
 ).toString(36);
 await Bun.write(join(DIST, "sw.js"), injectPrecacheManifest(swSource, precachePaths, version));