feat(web): dictation beta with mic button, cleanup and shortcut

[Yclpaiva]

What Changed

Dictation (Beta): microphone button next to the composer send button. Records via MediaRecorder, transcribes through an OpenAI-compatible /audio/transcriptions endpoint (default Groq + whisper-large-v3-turbo), optionally polishes with a chat-model cleanup pass (freeflow-inspired pipeline), and inserts the result as an editable composer draft. New global keybinding command composer.dictate (default mod+shift+D, remappable in Settings → Keybindings).

New Settings → Dictation (Beta) tab: enable toggle, API key (client-only, never hits the T3 server), base URL, transcription model, language, plus a Cleanup section (toggle, model, custom vocabulary, editable system prompt with reset).

Why

Voice input for the composer without a monthly subscription or server-side secrets — audio and API key stay between the browser and the user's own transcription provider, following the freeflow model (used as reference, reimplemented from scratch for the web).

UI Changes

Dictation (Beta) settings tab

Mic button next to send

Composer: Dictate keybinding

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add dictation beta with mic button, settings, and composer.dictate shortcut

• Adds useComposerDictation.ts to manage microphone recording, browser-based transcription, and optional transcript cleanup.
• Adds ComposerDictationButton to ChatComposer.tsx and binds the composer.dictate command to mod+shift+d.
• Adds DictationSettingsPanel.tsx to configure provider credentials, transcription models, language, and cleanup settings.
• Adds draft-textarea.tsx wrapper to commit multiline settings edits on blur or Cmd/Ctrl+Enter and discard them on Escape.
• Risk: DraftTextarea changes commit behavior for multiline settings fields; settings.ts defaults dictation to disabled.

^{Macroscope summarized f13b178.}

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a substantial production dictation workflow spanning microphone capture, external transcription and cleanup requests, settings, shortcuts, and composer behavior. It also introduces product defaults for provider and cleanup behavior, while the supplied unresolved concurrency and shortcut-state findings add further risk requiring human review.

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[shivamhwp]

Note: GPT-6 on behalf of Shivam (@shivamhwp).

Closing this duplicate in favor of your newer dictation proposal, #10195, so review can continue in one place. The newer PR includes the dictation flow and additional desktop microphone and settings-search support.