init: add source code from src.zip

src/hooks/useVoiceEnabled.ts

@@ -0,0 +1,25 @@
+import { useMemo } from 'react'
+import { useAppState } from '../state/AppState.js'
+import {
+  hasVoiceAuth,
+  isVoiceGrowthBookEnabled,
+} from '../voice/voiceModeEnabled.js'
+
+/**
+ * Combines user intent (settings.voiceEnabled) with auth + GB kill-switch.
+ * Only the auth half is memoized on authVersion — it's the expensive one
+ * (cold getClaudeAIOAuthTokens memoize → sync `security` spawn, ~60ms/call,
+ * ~180ms total in profile v5 when token refresh cleared the cache mid-session).
+ * GB is a cheap cached-map lookup and stays outside the memo so a mid-session
+ * kill-switch flip still takes effect on the next render.
+ *
+ * authVersion bumps on /login only. Background token refresh leaves it alone
+ * (user is still authed), so the auth memo stays correct without re-eval.
+ */
+export function useVoiceEnabled(): boolean {
+  const userIntent = useAppState(s => s.settings.voiceEnabled === true)
+  const authVersion = useAppState(s => s.authVersion)
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const authed = useMemo(hasVoiceAuth, [authVersion])
+  return userIntent && authed && isVoiceGrowthBookEnabled()
+}