buildVoiceFallbackText (hooks/useChatTTS.ts)

React hook that generates TTS fallback text and manages voice playback logic.

// Source: https://github.com/daggerhashimoto/openclaw-nerve | License: MIT | Copyright 2025-2026 Nerve contributors
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * useChatTTS — TTS playback logic extracted from ChatContext
 *
 * Manages voice fallback text generation, TTS marker extraction,
 * auto-speak logic, and played-sound deduplication.
 */
import { useRef, useCallback, useMemo } from 'react';
import { playPing } from '@/features/voice/audio-feedback';
import type { FinalMessageData } from '@/features/chat/operations';

// ─── Constants ──────────────────────────────────────────────────────────────────

export const FALLBACK_MAX_CHARS = 300;

// ─── Pure helpers ───────────────────────────────────────────────────────────────

/** Strip code blocks, markdown n

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