fix build error

src/App.tsx

@@ -139,6 +139,9 @@ function App() {
     }
 
     if (pitchData.midi === targetMidi) {
+      // Prevent re-triggering success if we're already in a success state
+      if (feedbackMessage === "Good!") return;
+
       if (matchStartTime === null) {
         setMatchStartTime(Date.now());
       } else {
@@ -147,6 +150,7 @@ function App() {
           // Success!
           setFeedbackMessage("Good!");
           setRevealed(true);
+          setMatchStartTime(null);
 
           const isRhythmActive = settings.rhythm.active && settings.rhythm.autoAdvance;
           const isTimerMode = settings.rhythm.mode === 'seconds';
@@ -157,7 +161,6 @@ function App() {
             setTimeout(() => {
               generateNewNote();
             }, 800);
-            setMatchStartTime(null);
           } else {
             // Rhythm Active AND Auto-Advance
             if (isTimerMode) {

src/components/SheetMusic.tsx

@@ -127,8 +127,7 @@ export const SheetMusic: React.FC<SheetMusicProps> = ({
             const data = getNoteInKey(visualMidi, keySignature);
             const ghost = new GhostNote({
                 keys: data.keys,
-                duration: "w",
-                clef: noteClef as 'treble' | 'bass'
+                duration: "w"
             });
 
             // Add a Question Mark Annotation
@@ -160,7 +159,7 @@ export const SheetMusic: React.FC<SheetMusicProps> = ({
                 if (clef === 'grand') noteClef = getGrandStaffClef(visualMidi);
                 const data = getNoteInKey(visualMidi, keySignature);
 
-                const ghost = new GhostNote({ keys: data.keys, duration: "h", clef: noteClef as 'treble' | 'bass' });
+                const ghost = new GhostNote({ keys: data.keys, duration: "h" });
                 ghost.addModifier(new Annotation("?").setVerticalJustification(Annotation.VerticalJustify.CENTER));
                 targetHalfObj = { note: ghost, clef: noteClef };
             } else {