fix: gr.Code has no placeholder — use empty value, hint moved to label

app.py

@@ -365,10 +365,10 @@ def build_app() -> gr.Blocks:
             # ---- Right column: editor + run + submit ----
             with gr.Column(scale=2):
                 code_editor = gr.Code(
-                    label="Your Legesher code",
+                    label="Your Legesher code — use native-language variable and function names",
                     language="python",
                     lines=20,
-                    placeholder="# Write your solution here using Legesher\n# Use native-language variable and function names",
+                    value="",
                 )
 
                 with gr.Row():