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, 76 insertions, 0 deletions

diff --git a/rust/crates/scene/src/project.rs b/rust/crates/scene/src/project.rs
new file mode 100644
index 00000000..6af6c3cc
--- /dev/null
+++ b/rust/crates/scene/src/project.rs
@@ -0,0 +1,76 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use time::{FrameRate, MediaTime};
+
+use crate::iso_date;
+use crate::scene::Scene;
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(tag = "type", rename_all = "camelCase", rename_all_fields = "camelCase")]
+pub enum Background {
+    Color { color: String },
+    Blur { blur_intensity: f64 },
+}
+
+#[derive(Serialize, Deserialize, Clone, Copy, Debug, Eq, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct CanvasSize {
+    pub width: u32,
+    pub height: u32,
+}
+
+#[derive(Serialize, Deserialize, Clone, Copy, Debug, Eq, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub enum CanvasSizeMode {
+    Preset,
+    Custom,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectMetadata {
+    pub id: String,
+    pub name: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub thumbnail: Option<String>,
+    pub duration: MediaTime,
+    #[serde(with = "iso_date")]
+    pub created_at: DateTime<Utc>,
+    #[serde(with = "iso_date")]
+    pub updated_at: DateTime<Utc>,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectSettings {
+    pub fps: FrameRate,
+    pub canvas_size: CanvasSize,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub canvas_size_mode: Option<CanvasSizeMode>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub last_custom_canvas_size: Option<CanvasSize>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub original_canvas_size: Option<CanvasSize>,
+    pub background: Background,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct TimelineViewState {
+    pub zoom_level: f64,
+    pub scroll_left: f64,
+    pub playhead_time: MediaTime,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct Project {
+    pub metadata: ProjectMetadata,
+    #[serde(default)]
+    pub scenes: Vec<Scene>,
+    pub current_scene_id: String,
+    pub settings: ProjectSettings,
+    pub version: u32,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub timeline_view_state: Option<TimelineViewState>,
+}