Style incoming call notification

crates/gpui/src/platform/test.rs

@@ -131,6 +131,10 @@ impl super::Platform for Platform {
 
     fn quit(&self) {}
 
+    fn screen_size(&self) -> Vector2F {
+        vec2f(1024., 768.)
+    }
+
     fn open_window(
         &self,
         _: usize,