fix: SpessaSynth init retry + default SF3 auto-load

- getAudioContext() calls SonicSF.init on every call (not just first)
- soundfontPlayer.init retries after 1s if SpessaSynth module not loaded yet
- Auto-loads sgm_v2.01 SF3 on successful init
- Fixes race condition: module script loads after regular scripts

app/static/js/app.jsx

@@ -37,13 +37,13 @@ function getAudioContext() {
     if (window.SonicAudio && window.SonicAudio.initAudioWorklet) {
       window.SonicAudio.initAudioWorklet();
     }
-    if (window.SonicSF && window.SonicSF.init) {
-      window.SonicSF.init(audioCtx);
-    }
   }
   if (audioCtx.state === 'suspended') {
     audioCtx.resume();
   }
+  if (window.SonicSF && window.SonicSF.init) {
+    window.SonicSF.init(audioCtx);
+  }
   return audioCtx;
 }
 const formatTime = secs => {