feat: add waveform generation and timeline display

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/components/Timeline.svelte

@@ -69,7 +69,9 @@
         session.duration,
         clipStore.clips,
         clipStore.selectedClipId,
-        clipStore.pendingInPoint
+        clipStore.pendingInPoint,
+        session.waveformPeaks,
+        session.thumbnailSpritesheets
       );
       ctx.restore();
       animFrameId = requestAnimationFrame(draw);