feat(speech): add prompt voice input (#249)

## Summary
- add server-backed speech capabilities and transcription endpoints plus
UI settings for speech configuration
- add push-to-talk prompt voice input with microphone controls,
transcription insertion, and browser capability gating
- keep prompt controls aligned by restoring right-side nav placement and
moving the mic beside the expand control

packages/server/package.json

@@ -32,6 +32,7 @@
     "fastify": "^4.28.1",
     "fuzzysort": "^2.0.4",
     "node-forge": "^1.3.3",
+    "openai": "^6.27.0",
     "pino": "^9.4.0",
     "undici": "^6.19.8",
     "yaml": "^2.4.2",