feat: sending base64 image to backend

This is silly, but binary is apparently hard to do????

frontend/src/components/ImageViewer.tsx

@@ -9,11 +9,13 @@ export function ImageViewer() {
     createEffect(() => {
         // Listen for PNG processing events
         const unlisten = listen("png-processed", (event) => {
-            console.log("Received processed PNG");
+            console.log("Received processed PNG", event);
             const base64Data = event.payload as string;
-            setLatestImage(`data:image/png;base64,${base64Data}`);
 
-            sendImage("test-image.png", base64Data);
+            const urlImage = `data:image/png;base64,${base64Data}`;
+            setLatestImage(urlImage);
+
+            sendImage("test-image.png", urlImage);
         });
 
         return () => {