fix(vscode): disable voice input in remote windows

[marius-kilocode]

What Problem This Solves

Voice input fails in remote VS Code windows (Remote-SSH, WSL, dev containers, tunnels). The reporter connected VS Code on Windows to a remote server, started voice input, and got Could not start microphone recording. Kilo was trying to open a microphone on the remote machine, not on the user's machine.

Closes #14197

Why This Change Was Made

Recording runs in the extension host. capture.ts spawns osascript/AVFoundation, FFmpeg, or pw-record in that host, and in a remote window the host is the remote machine, which normally has no capture device. Microphone selection cannot fix this, because enumeration only sees devices on the remote machine and the user's microphone is on the local client.

The real fix is capturing in the webview with getUserMedia and MediaRecorder, so the browser process on the local client owns the microphone. That is a larger change. This PR is the stopgap: detect the window kind and turn the feature off instead of letting every remote user hit a broken recording attempt.

User Impact

• In a remote window the microphone button no longer appears in the prompt input, the speech shortcut is inert, prewarming is skipped, and the Agent Manager new worktree dialog and diff viewer review annotations show no microphone.
• Settings > Models > Speech to Text explains that voice input needs a local window.
• Local windows keep the current behavior, including non-default microphone setups through KILO_FFMPEG_AUDIO_DEVICE.

Evidence

• New speechToText capability computed from vscode.env.remoteName in src/features.ts, passed into canUseSpeechToText at every webview gate.
• bun run compile (host typecheck, webview typecheck, lint, bundle) passes.
• Full extension unit suite: 6026 pass, 0 fail.
• Isolated VS Code self-test in a local window: microphone button present, Speech to Text row shows the normal Gateway description, no webview console errors.
• Limitation: the remote branch cannot be exercised locally, because the isolated harness always starts a local window. It is covered by unit tests only (configFeatures({}, false, true), canUseSpeechToText(..., false), and the prewarm effect gate).

Follow-Up

Move capture into the webview with getUserMedia + MediaRecorder, then re-enable voice input in remote windows.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (36 files)

• .changeset/remote-speech-to-text.md
• packages/kilo-docs/pages/code-with-ai/features/speech-to-text.md
• packages/kilo-vscode/src/features.ts
• packages/kilo-vscode/tests/unit/indexing-utils.test.ts
• packages/kilo-vscode/tests/unit/speech-to-text-availability.test.ts
• packages/kilo-vscode/tests/unit/speech-to-text-prewarm.test.ts
• packages/kilo-vscode/webview-ui/agent-manager/NewWorktreeDialog.tsx
• packages/kilo-vscode/webview-ui/diff-viewer/review-setup.ts
• packages/kilo-vscode/webview-ui/src/components/chat/PromptInput.tsx
• packages/kilo-vscode/webview-ui/src/components/settings/ModelsTab.tsx
• packages/kilo-vscode/webview-ui/src/components/speech-to-text/SpeechToTextPrewarm.tsx
• packages/kilo-vscode/webview-ui/src/components/speech-to-text/availability.ts
• packages/kilo-vscode/webview-ui/src/context/config.tsx
• packages/kilo-vscode/webview-ui/src/i18n/{ar,br,bs,da,de,en,es,fa,fr,it,ja,ko,nl,no,pl,ru,th,tr,uk,zh,zht}.ts
• packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
• packages/kilo-vscode/webview-ui/src/types/messages/config.ts

All four webview speech entry points (prompt input, Agent Manager new worktree dialog, diff/review annotations, prewarm) consume the new features().speechToText flag, and every host path that emits configLoaded/configUpdated includes it. features.ts derives the capability from vscode.env.remoteName in the extension host and all existing configFeatures callers still pass backgroundSubagents positionally, so the new third parameter is safe. Storybook defaults keep existing snapshots showing the microphone. No correctness, security, or resource-lifetime issues found in the changed lines.

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_{Reviewed by deepseek-v4.1-flash · Input: 0 · Output: 0 · Cached: 0}

_{Review guidance: REVIEW.md from base branch main}