Desktop: Isolate CEF-rendered UI into separate crate and process (#4321)

* Extract CEF rendered UI into a separate process and crate

* Review

* Review

* Review

* Review

* Remove necessary workarounds

* Block on frame copy ack

* Crop and resample frames correctly

* Skip blank frames

* Fix deps

* Fix fmt

* Fix clippy warning

* Review

* Fix todo

desktop/src/event.rs

@@ -3,12 +3,12 @@ use crate::wrapper::messages::DesktopWrapperMessage;
 
 pub(crate) enum AppEvent {
 	UiUpdate(wgpu::Texture),
-	CursorChange(crate::window::Cursor),
-	ScheduleBrowserWork(std::time::Instant),
+	CursorChange(graphite_desktop_ui::Cursor),
 	WebCommunicationInitialized,
 	DesktopWrapperMessage(DesktopWrapperMessage),
 	NodeGraphExecutionResult(NodeGraphExecutionResult),
 	Exit,
+	UiCrashed,
 	OpenFiles(Vec<std::path::PathBuf>),
 	#[cfg(target_os = "macos")]
 	MenuEvent {