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

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

src/lib/timeline/interactions.ts

@@ -17,6 +17,13 @@ export function computeZoom(
   duration: number
 ): { visibleStart: number; visibleEnd: number; zoom: number } {
   const currentRange = state.visibleEnd - state.visibleStart;
+  if (currentRange <= 0) {
+    return {
+      visibleStart: state.visibleStart,
+      visibleEnd: state.visibleEnd,
+      zoom: state.zoom,
+    };
+  }
   const newRange = currentRange / factor;
   const clampedRange = Math.max(MIN_VISIBLE_RANGE, Math.min(newRange, duration));