Fix chat interface readability with white text on panels

- Changed text color to white for better contrast against panel backgrounds
- Kept colored borders for visual distinction between agent types
- Maintains cyan borders for central agent, magenta for lenses

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[e-mail]>

organon/chat_with_kaleidoscope.py

···
                 
                 # Color based on sender type
                 if "central" in sender.lower():
-                    color = "cyan"
+                    border_color = "cyan"
                     icon = "🧠"
                 elif any(keyword in sender.lower() for keyword in ["lens", "pattern", "creative", "systems", "temporal"]):
-                    color = "magenta"
+                    border_color = "magenta"
                     icon = "🔮"
                 else:
-                    color = "white"
+                    border_color = "white"
                     icon = "💬"
                 
                 self.console.print(Panel(
-                    Text(content, style=color),
+                    Text(content, style="white"),
                     title=f"{icon} {sender}",
-                    border_style=color
+                    border_style=border_color
                 ))
         else:
             self.console.print("[yellow]No response messages received[/yellow]")