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, 33 insertions, 0 deletions

diff --git a/rust/crates/scene/src/scene.rs b/rust/crates/scene/src/scene.rs
new file mode 100644
index 00000000..ce59bce7
--- /dev/null
+++ b/rust/crates/scene/src/scene.rs
@@ -0,0 +1,33 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use time::MediaTime;
+
+use crate::iso_date;
+use crate::track::SceneTracks;
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct Bookmark {
+    pub time: MediaTime,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub note: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub color: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub duration: Option<MediaTime>,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct Scene {
+    pub id: String,
+    pub name: String,
+    pub is_main: bool,
+    pub tracks: SceneTracks,
+    #[serde(default)]
+    pub bookmarks: Vec<Bookmark>,
+    #[serde(with = "iso_date")]
+    pub created_at: DateTime<Utc>,
+    #[serde(with = "iso_date")]
+    pub updated_at: DateTime<Utc>,
+}