Implement alternating full-width background for chat messages

pytchat_listener.py

@@ -61,15 +61,23 @@ def main():
                 # Apply emoji coloring using the new function
                 message_text = colour_emoji(message_text)
 
-                # Alternate background styles
-                background_style = Style(bgcolor="#2B2B2B") if message_count % 2 == 0 else Style(bgcolor="#3A3A3A")
-                
                 # Simple color for username (can be expanded to unique colors per user)
                 username_style = Style(color="#4CAF50", bold=True)
 
-                # Format message for terminal and log file
+                # Format message for terminal
                 formatted_message = f"[{username_style}]{author_display_name}[/]: {message_text}"
-                console.print(formatted_message, style=background_style)
+
+                # Calculate padding to fill terminal width
+                # rich handles rendering, so we need to calculate the visible width of the string
+                # and pad it. This is a simplified approach, rich's Panel might be better for complex layouts.
+                rendered_length = console.measure(formatted_message).cell_len
+                padding = max(0, console.width - rendered_length)
+                padded_message = f"{formatted_message}{' ' * padding}"
+
+                # Alternate background styles
+                background_style = Style(bgcolor="#2B2B2B") if message_count % 2 == 0 else Style(bgcolor="#3A3A3A")
+                
+                console.print(padded_message, style=background_style, overflow="crop")
                 log_file.write(f"{datetime.now().strftime("%H:%M:%S")} {formatted_message}\n")
                 message_count += 1