Make the Rust client the sole app

app/src/lib.rs

@@ -0,0 +1,10 @@
+pub mod client;
+
+#[cfg(feature = "screens")]
+pub mod ui;
+
+#[cfg(all(feature = "screens", not(target_os = "android")))]
+pub mod desktop;
+
+#[cfg(all(feature = "screens", target_os = "android"))]
+pub mod android;