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, 58 insertions, 0 deletions

diff --git a/rust/crates/commands/src/scene/rename_scene.rs b/rust/crates/commands/src/scene/rename_scene.rs
new file mode 100644
index 00000000..4876fb9b
--- /dev/null
+++ b/rust/crates/commands/src/scene/rename_scene.rs
@@ -0,0 +1,58 @@
+use scene::Project;
+
+use crate::command::{Command, CommandError, CommandResult};
+
+pub struct RenameSceneCommand {
+    scene_id: String,
+    new_name: String,
+    saved_name: Option<String>,
+    saved_updated_at: Option<chrono::DateTime<chrono::Utc>>,
+}
+
+impl RenameSceneCommand {
+    pub fn new(scene_id: impl Into<String>, new_name: impl Into<String>) -> Self {
+        Self {
+            scene_id: scene_id.into(),
+            new_name: new_name.into(),
+            saved_name: None,
+            saved_updated_at: None,
+        }
+    }
+}
+
+impl Command for RenameSceneCommand {
+    fn execute(
+        &mut self,
+        project: &mut Project,
+    ) -> Result<Option<CommandResult>, CommandError> {
+        let Some(scene) = project
+            .scenes
+            .iter_mut()
+            .find(|scene| scene.id == self.scene_id)
+        else {
+            return Ok(None);
+        };
+
+        self.saved_name = Some(scene.name.clone());
+        self.saved_updated_at = Some(scene.updated_at);
+        scene.name = self.new_name.clone();
+        scene.updated_at = chrono::Utc::now();
+        Ok(None)
+    }
+
+    fn undo(&mut self, project: &mut Project) {
+        let (Some(saved_name), Some(saved_updated_at)) =
+            (&self.saved_name, self.saved_updated_at)
+        else {
+            return;
+        };
+        if let Some(scene) = project
+            .scenes
+            .iter_mut()
+            .find(|scene| scene.id == self.scene_id)
+        {
+            scene.name = saved_name.clone();
+            scene.updated_at = saved_updated_at;
+        }
+    }
+}