feat(tui): add voice input with Alt+V shortcut

[lemantorus]

What this PR does:
This PR fixes the voice input feature which was broken with "No context found for instance" error:

1. Root cause: VoiceContextProvider initialized immediately and called Config.get() which requires Instance context. But TUI was running outside Instance.provide() context.

2. Fix:

   • Move TUI execution inside Instance.provide() in thread.ts and attach.ts
   • Lazy-load voice provider on first Alt+V press instead of on context creation
   • Register /voice command on home screen (was only in session)

3. New feature: Adds voice input with Alt+V shortcut using Groq/OpenAI Whisper
   Why it works: By running TUI inside Instance.provide(), all config access works correctly. Lazy initialization ensures voice provider loads only when needed.

Screenshots/recordings: Можешь записать скринкаст работы Alt+V

Checklist:

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

Screenshots:

I sign off this contribution under the developer certificate of origin (DCO).
Closes #14095

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

Potential Related PRs Found

The current PR #17487 addresses voice input functionality in the TUI. I found several related PRs that may be relevant:

1. PR feat: voice-typing using external Whisper / ALM API #9264 - "feat: voice-typing using external Whisper / ALM API"

   • Related: Also implements voice transcription using Whisper/external APIs

2. PR feat: add first-party voice transcription with local Whisper #11345 - "feat: add first-party voice transcription with local Whisper"

   • Related: Implements voice transcription with local Whisper integration

3. PR Add voice-to-text transcription feature #3827 - "Add voice-to-text transcription feature"

   • Related: Earlier voice-to-text transcription implementation

These PRs appear to be related to the voice input feature, but they likely represent different iterations or approaches to voice functionality. PR #17487 is specifically a fix for enabling voice input that was broken, rather than a duplicate of an open issue with the same fix in progress.

Recommendation: Check if PRs #9264 or #11345 are open or merged to understand if this fix (#17487) supersedes them or builds upon previous voice implementation work.

[lemantorus]

I hereby sign off this contribution under the developer certificate of origin (DCO).

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