click on waveform

src/lib/components/WaveformDisplay.svelte

@@ -8,7 +8,7 @@
     selectionStart?: number | null;
     selectionEnd?: number | null;
     onselectionchange?: (start: number | null, end: number | null) => void;
-    onclick?: () => void;
+    onclick?: (timeOffset: number) => void;
   }
 
   let {
@@ -75,8 +75,9 @@
       }
     }
 
-    if (onclick) {
-      onclick();
+    if (onclick && buffer) {
+      const timeOffset = (x / canvas.width) * (buffer.length / buffer.sampleRate);
+      onclick(timeOffset);
     }
   }