return image size so the client side can determine whether to crop or not

src/lib.rs

@@ -101,22 +101,23 @@ pub fn load_image(image_base64: String) -> String {
         Ok(image) => {
             match image::load_from_memory(image.as_ref()) {
                 Ok(image) => {
+                    let size = format!("{}×{}", image.width(), image.height());
                     // todo get rid of magic numbers! what about Bitsy HD?
                     let image = image.resize(128, 128, CatmullRom);
                     state.image = Some(image);
-                    "OK"
+                    size
                 },
                 _ => {
                     state.image = None;
-                    "Couldn't load image"
+                    "Couldn't load image".to_string()
                 }
             }
         },
         _ => {
             state.image = None;
-            "Couldn't decode image"
+            "Couldn't decode image".to_string()
         }
-    }.to_string()
+    }
 }
 
 #[wasm_bindgen]