added eg png

app.py

@@ -77,6 +77,16 @@ def load_private_app(repo_path):
     sys.path.insert(0, str(repo_path))
     try:
         import app as private_app
+        # If the private app exposes a thumbnail generator, run it once
+        # so example images are ready even when we bypass its main().
+        try:
+            if hasattr(private_app, "generate_example_thumbnails"):
+                print("🖼  Generating example thumbnails in private app...")
+                private_app.generate_example_thumbnails()
+        except Exception:
+            # Thumbnails are optional; don't break startup if this fails.
+            traceback.print_exc()
+
         # Check for app or demo attribute
         if hasattr(private_app, "app"):
             return private_app.app