convert flacs to aac for streaming

package.json

@@ -5,6 +5,7 @@
   "type": "module",
   "scripts": {
     "build": "next build",
+    "build:ffmpeg-worker": "bun build node_modules/@ffmpeg/ffmpeg/dist/esm/worker.js --target browser --format esm --minify --outfile public/ffmpeg/worker.js",
     "check": "biome check .",
     "check:unsafe": "biome check --write --unsafe .",
     "check:write": "biome check --write .",
@@ -23,6 +24,8 @@
     "@ai-sdk/react": "^3.0.195",
     "@clerk/nextjs": "^7.4.2",
     "@electric-sql/pglite": "^0.4.6",
+    "@ffmpeg/ffmpeg": "^0.12.15",
+    "@ffmpeg/util": "^0.12.2",
     "@fortawesome/fontawesome-svg-core": "^7.2.0",
     "@fortawesome/free-solid-svg-icons": "^7.2.0",
     "@fortawesome/react-fontawesome": "^3.3.1",