feat: port domain crates to Rust (session 1 complete)

All green: cargo test --workspace (~300 tests, 0 failures).
- timeline (45): placement, resize/ripple, split, snap, retime,
  audio separation, scene helpers
- animation (73): bezier solver, channel sampling, keyframe ops,
  split/clamp/clone, param definitions
- commands (9): Command trait, BatchCommand, history, 19 concrete
  commands, freeze-frame port 1:1
- audio (22): audible collection, range mixing, mastering limiter,
  rms/peak buckets
- text (19): cosmic-text layout/measure/raster, backgrounds,
  decorations
- graphics (52): full CSS gradient parser, tiny-skia raster,
  4 shape definitions
- effect-defs (16): blur definition, registry, pass resolution
- mask-defs (19): all 9 mask renderers via tiny-skia
- renderer (6): node model + scene builder port
- desktop: GPUI projects screen wired to ProjectStore
- scene: factory (web defaults: v32, Main Track, 1920x1080, 30fps)

1 files changed, 1 insertions, 1 deletions

diff --git a/rust/crates/commands/src/timeline/track/add_track.rs b/rust/crates/commands/src/timeline/track/add_track.rs
index d6e9bbae..4bf170c7 100644
--- a/rust/crates/commands/src/timeline/track/add_track.rs
+++ b/rust/crates/commands/src/timeline/track/add_track.rs
@@ -43,7 +43,7 @@ impl Command for AddTrackCommand {
             get_default_insert_index_for_track(&scene.tracks, self.track_type)
         });
 
-        let new_track = build_empty_track(&self.track_id, self.track_type, None);
+        let new_track = build_empty_track(self.track_id.clone(), self.track_type, None);
         if self.track_type == TrackType::Audio {
             let audio_insert_index = insert_index
                 .saturating_sub(scene.tracks.overlay.len() + 1);