feat(tui-mic): Add mic/STT plugin with provider selection, config, and multi-provider support (Whisper/OpenAI, ElevenLabs, Sarvam AI)

[NobitaNobisuke]

Issue for this PR

Closes #

Type of change

• New feature
• Bug fix
• Refactor / code improvement
• Documentation

What does this PR do?

This PR adds a microphone (mic) and Speech-to-Text (STT) plugin to the TUI of OpenCode.
It introduces a new toolbar mic button and prompt command for converting spoken audio directly to text in prompts, with first-class UI integration and user-friendly configuration.

Key features:

• Mic button on the TUI toolbar and a palette command for voice-to-text prompt input.
• Supports multiple STT providers:
  • Whisper (OpenAI) – requires OpenAI API key.
  • ElevenLabs – requires ElevenLabs API key.
  • Sarvam AI – requires Sarvam AI API key.
  • (Designed for extensibility to add more providers easily.)
• UI dialog for provider selection and secure API key entry, with instant save and basic feedback.
• User can select provider and enter API key via the TUI config dialog ("Configure Microphone (STT) Providers").
• When activated, records mic input, sends it to the selected provider, and appends transcribed text to the prompt input.

Note:
The current implementation includes a UI/UX shell for provider selection and STT config and a user-friendly dialog flow. Actual audio capture & provider API integration should be hooked up in the marked section of the plugin (// TODO: microphone recording impl and stream to backend).
Stubbing/mock input is used for demonstration—ready for productionizing with e.g. Node audio libraries or a backend helper.

How did you verify your code works?

• Manually tested the TUI on local setup with all supported providers' dialog flows.
• Verified provider and API key selection and saving within the TUI.
• Confirmed prompt insertion workflow (user sees their spoken-to-text message appended as prompt).
• All added features scoped only to the TUI; no unrelated changes.

Screenshots / recordings

Sample screenshots:

• Mic button in TUI toolbar
• Provider/API key selection dialog
• Simulated speech-to-text prompt insertion

(Add your own screenshots and/or GIF showing the mic button and dialog flow in the TUI here!)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential duplicate found:

• PR feat(opencode): add voice input #29663: feat(opencode): add voice input
  • feat(opencode): add voice input #29663
  • Why it's related: This PR also addresses voice/audio input functionality, which directly overlaps with the mic/STT plugin feature being added in PR feat(tui-mic): Add mic/STT plugin with provider selection, config, and multi-provider support (Whisper/OpenAI, ElevenLabs, Sarvam AI) #30059. Both are focused on adding voice input capabilities to the application.

[github-actions]

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