Desktop: Add Eyedropper tool support with native Vello (#3684)

* mostly done

* fix

* kinda works but tilt and flip broken

* fix footprint

Co-authored-by: James Lindsay <78500760+0HyperCube@users.noreply.github.com>

* Code review

* fix cursor hiding

* Remove console.log

---------

Co-authored-by: James Lindsay <78500760+0HyperCube@users.noreply.github.com>
Co-authored-by: Keavon Chambers <keavon@keavon.com>

desktop/src/window.rs

@@ -169,7 +169,12 @@ impl Window {
 				};
 				custom_cursor.into()
 			}
+			Cursor::None => {
+				self.winit_window.set_cursor_visible(false);
+				return;
+			}
 		};
+		self.winit_window.set_cursor_visible(true);
 		self.winit_window.set_cursor(cursor);
 	}
 
@@ -215,6 +220,7 @@ impl Window {
 pub(crate) enum Cursor {
 	Icon(CursorIcon),
 	Custom(CustomCursorSource),
+	None,
 }
 impl From<CursorIcon> for Cursor {
 	fn from(icon: CursorIcon) -> Self {