LaTeX tab: switch gr.Code to gr.Textbox with show_copy_button for easy copy-paste

app.py

@@ -716,7 +716,8 @@ hidden activations — but here it is readable directly from the token sequence.
             gr.Markdown("Each block is a self-contained chunk. Click the copy icon top-right of each box.")
 
             gr.Markdown("#### § Arithmetic setup + Quirke subtask definitions")
-            gr.Code(value=LATEX_ARITHMETIC_SETUP, language="latex", label="arithmetic_setup.tex")
+            gr.Textbox(value=LATEX_ARITHMETIC_SETUP, label="arithmetic_setup.tex",
+                       lines=30, show_copy_button=True, interactive=False)
 
         # ── Tab 4: About ──
         with gr.TabItem("About"):