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

package-lock.json

@@ -8240,6 +8240,27 @@
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+      "bin": {
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@@ -12019,6 +12040,7 @@
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@@ -12080,6 +12102,7 @@
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         "node-forge": "^1.3.3",
+        "openai": "^6.27.0",
         "pino": "^9.4.0",
         "undici": "^6.19.8",
         "yaml": "^2.4.2",