Add typewriter clatter during text reveal

A dry synthesized key-clack (filtered noise burst with pitch jitter) plays as
each line types out — every other non-space character — for a detective-terminal
feel. Skipped in the editor preview and when reduced-motion is set.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/narrative.tsx

@@ -84,6 +84,13 @@ export function DialoguePlayer({ node, onExit, inline, startId }: { node: { utte
     return () => window.clearInterval(id)
   }, [currentId, fullText, reduced]) // eslint-disable-line react-hooks/exhaustive-deps
 
+  // Typewriter clatter as characters are revealed (every other non-space char).
+  useEffect(() => {
+    if (inline || charCount === 0 || charCount > fullText.length) return
+    const ch = fullText[charCount - 1]
+    if (ch && ch !== ' ' && charCount % 2 === 0) audio.type()
+  }, [charCount]) // eslint-disable-line react-hooks/exhaustive-deps
+
   const pick = (choice: RuntimeUtterance) => {
     if (!inline) audio.sfx('choice')
     if (choice.childIds.length > 0) setCurrentId(choice.childIds[0])