Fix side-by-side before/after output in Single Procedure tab

app.py

@@ -239,6 +239,9 @@ def process_image(image_rgb, procedure, intensity):
         composited = mask_composite(warped, image_bgr, mask)
         composited_rgb = cv2.cvtColor(composited, cv2.COLOR_BGR2RGB)
 
+        # Side-by-side comparison: original on left, result on right
+        sbs = np.hstack([image_rgb_512, composited_rgb])
+
         displacement = np.mean(
             np.linalg.norm(manipulated.pixel_coords - face.pixel_coords, axis=1)
         )
@@ -254,7 +257,7 @@ def process_image(image_rgb, procedure, intensity):
             f"Processing time: {elapsed:.2f}s\n"
             f"Mode: TPS (CPU)"
         )
-        return wireframe_rgb, mask_vis, composited_rgb, image_rgb_512, info
+        return wireframe_rgb, mask_vis, composited_rgb, sbs, info
 
     except Exception as exc:
         logger.error("Processing failed: %s\n%s", exc, traceback.format_exc())