fix: address final review findings (clip reset, codecs, paths, timeline)

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

src/lib/transport/playback.ts

@@ -44,6 +44,13 @@ export function jumpKeyframe(direction: 1 | -1) {
   }
 }
 
+export function resetShuttleRate() {
+  const videoEl = document.querySelector('video');
+  if (videoEl) {
+    videoEl.playbackRate = 1;
+  }
+}
+
 export function adjustShuttle(dir: 1 | -1, shuttleRate: number): number {
   const videoEl = document.querySelector('video');
   if (!videoEl) return shuttleRate;