feat: GPUI desktop port foundation

- scene crate: full project/scene/element model, serde round-trip
  proven against the web SerializedProject shape
- transfer crate: .ocp zip container, cross-compat with web fflate
  archives proven in both directions
- storage crate: filesystem project store replacing IndexedDB,
  .ocp import/export
- media crate: ffmpeg-next 8 decoder (frames, audio, thumbnails,
  waveform summaries)
- playback crate: wall-clock anchored, frame-rounded playback clock
- gpu crate: native texture readback; compositor renders headless
  offscreen on Vulkan (spike test)
- flake devshell: rust toolchain, GPUI native deps, ffmpeg dev,
  bindgen clang args; GPUI hello-world builds
- port plan in notes/gpui-port.md

1 files changed, 9 insertions, 0 deletions

diff --git a/rust/crates/commands/src/timeline/track/mod.rs b/rust/crates/commands/src/timeline/track/mod.rs
new file mode 100644
index 00000000..c133a12d
--- /dev/null
+++ b/rust/crates/commands/src/timeline/track/mod.rs
@@ -0,0 +1,9 @@
+pub mod add_track;
+pub mod remove_track;
+pub mod toggle_track_mute;
+pub mod toggle_track_visibility;
+
+pub use add_track::AddTrackCommand;
+pub use remove_track::RemoveTrackCommand;
+pub use toggle_track_mute::ToggleTrackMuteCommand;
+pub use toggle_track_visibility::ToggleTrackVisibilityCommand;