fix: Gradio 6.0 compatibility - remove show_copy_button, fix CSS injection

app.py

@@ -299,7 +299,8 @@ label {
 """
 
 # Build Gradio interface
-with gr.Blocks(css=custom_css, title="UltraData Math Parser") as demo:
+with gr.Blocks(title="UltraData Math Parser") as demo:
+    gr.HTML(f'<style>{custom_css}</style>')
     gr.HTML('<h1 class="main-title">📐 UltraData Math Parser</h1>')
     gr.HTML('<p class="subtitle">Unified HTML Parser for Mathematical Content Extraction</p>')
     
@@ -365,7 +366,6 @@ with gr.Blocks(css=custom_css, title="UltraData Math Parser") as demo:
                         max_lines=15,
                         interactive=False,
                         autoscroll=False,
-                        show_copy_button=True,
                     )
                 with gr.TabItem("📄 Plain Text"):
                     text_output = gr.Textbox(
@@ -374,7 +374,6 @@ with gr.Blocks(css=custom_css, title="UltraData Math Parser") as demo:
                         max_lines=15,
                         interactive=False,
                         autoscroll=False,
-                        show_copy_button=True,
                     )
                 with gr.TabItem("👁️ Preview"):
                     preview_output = gr.HTML(