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, 13 insertions, 24 deletions

diff --git a/apps/desktop/src/main.rs b/apps/desktop/src/main.rs
index 0ba70959..0508aa33 100644
--- a/apps/desktop/src/main.rs
+++ b/apps/desktop/src/main.rs
@@ -1,24 +1,17 @@
-use gpui::{
-    div, prelude::*, px, rgb, size, App, Application, Bounds, Context, SharedString, Window,
-    WindowBounds, WindowOptions,
-};
+use std::path::PathBuf;
 
-struct AppWindow {
-    title: SharedString,
-}
+use gpui::{App, AppContext, Application, Bounds, WindowBounds, WindowOptions, px, size};
+
+mod app;
+mod projects_view;
+mod theme;
 
-impl Render for AppWindow {
-    fn render(&mut self, _window: &mut Window, _cx: &mut Context<Self>) -> impl IntoElement {
-        div()
-            .size_full()
-            .bg(rgb(0x0f0f0f))
-            .flex()
-            .justify_center()
-            .items_center()
-            .text_xl()
-            .text_color(rgb(0xffffff))
-            .child(self.title.clone())
-    }
+use app::OpenCutApp;
+
+pub fn projects_root() -> PathBuf {
+    std::env::home_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join(".local/share/opencut/projects")
 }
 
 fn main() {
@@ -29,11 +22,7 @@ fn main() {
                 window_bounds: Some(WindowBounds::Windowed(bounds)),
                 ..Default::default()
             },
-            |_, cx| {
-                cx.new(|_| AppWindow {
-                    title: "OpenCut".into(),
-                })
-            },
+            |_, cx| cx.new(|cx| OpenCutApp::new(cx)),
         )
         .unwrap();
         cx.activate(true);