🎙️ fix: Prefer Compatible Formats for External STT Recording

[berry-13]

Summary

External STT recording now prefers audio/ogg;codecs=opus, audio/ogg, and audio/wav before WebM or MP4 when the browser supports them. Some OpenAI-compatible transcription providers reject WebM and MP4 uploads with an invalid file format response.

This branch preserves the original implementation from #11528 and adds direct regression coverage for the MIME priority and existing browser fallbacks. It supersedes #11528 because its source fork does not allow maintainer edits.

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

• cd client && npx jest src/hooks/Input/useSpeechToTextExternal.spec.ts --runInBand --coverage=false
• npx eslint client/src/hooks/Input/useSpeechToTextExternal.ts client/src/hooks/Input/useSpeechToTextExternal.spec.ts
• cd client && npm run typecheck -- --pretty false
• The original contributor verified OGG recording and transcription with Firefox, Scaleway STT, and the whisper-large-v3 model.

Test Configuration:

• Node.js v24.16.0
• Jest with jsdom
• Firefox with Scaleway's OpenAI-compatible Audio Transcriptions API for the manual provider check

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes

[berry-13]

@codex review

[Copilot]

Pull request overview

This PR updates the external Speech-to-Text (STT) recording MIME type selection logic so that browsers prefer OGG (Opus) and WAV formats before falling back to WebM or MP4, improving compatibility with OpenAI-compatible transcription providers that reject WebM/MP4 uploads.

Changes:

• Reorders the MIME type preference list to prioritize audio/ogg;codecs=opus, audio/ogg, and audio/wav ahead of WebM/MP4.
• Extracts and exports getBestSupportedMimeType for reuse and direct unit testing.
• Adds Jest regression coverage validating both MIME priority probing order and UA-based fallbacks when no formats are supported.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
client/src/hooks/Input/useSpeechToTextExternal.ts	Updates and exports MIME-type selection to prefer OGG/WAV first while retaining existing fallback behavior.
client/src/hooks/Input/useSpeechToTextExternal.spec.ts	Adds regression tests to enforce MIME priority order and browser fallback defaults.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

Reviewed commit: d480382989

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".