Fix SFX: unlock AudioContext from the click, louder/clearer blips

sfx() bailed whenever the context wasn't already 'running', so the autoplay-unlock
race dropped the blips. It's invoked from a click, so resume the context there and
always schedule the tone; bump the envelope and use a triangle wave (with a small
up-chirp on choices) for a more audible cue.

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

src/audio.ts

@@ -55,16 +55,20 @@ export const audio = {
   sfx(kind: Sfx) {
     if (muted) return
     const context = audioContext()
-    if (!context || context.state !== 'running') return
+    if (!context) return
+    // Called from a click, so we can unlock the context right here if it's suspended.
+    if (context.state === 'suspended') void context.resume()
     const osc = context.createOscillator(), gain = context.createGain()
-    osc.type = 'sine'
+    osc.type = 'triangle'
-    osc.frequency.value = kind === 'choice' ? 540 : kind === 'sting' ? 300 : 400
+    const now = context.currentTime + 0.01
-    const now = context.currentTime
+    const base = kind === 'choice' ? 500 : kind === 'sting' ? 260 : 420
+    osc.frequency.setValueAtTime(base, now)
+    if (kind === 'choice') osc.frequency.exponentialRampToValueAtTime(base * 1.5, now + 0.09) // a little up-chirp
     gain.gain.setValueAtTime(0.0001, now)
-    gain.gain.exponentialRampToValueAtTime(0.07, now + 0.008)
+    gain.gain.exponentialRampToValueAtTime(0.16, now + 0.012)
-    gain.gain.exponentialRampToValueAtTime(0.0001, now + 0.12)
+    gain.gain.exponentialRampToValueAtTime(0.0001, now + 0.16)
     osc.connect(gain).connect(context.destination)
-    osc.start(now); osc.stop(now + 0.13)
+    osc.start(now); osc.stop(now + 0.18)
   },
   // Resume the context and retry pending music on a user gesture.
   resume() {