Add detected IP display in dashboard Agent row

Display the connection IP address that the dashboard is configured to use
for each host below the Agent version information. Shows which network
path (local/Tailscale) is being used for connections based on host
configuration.

Features:
- Display detected IP below Agent row in system widget
- Uses existing host configuration connection logic
- Shows actual IP being used for dashboard connections

dashboard/src/ui/mod.rs

@@ -829,8 +829,10 @@ impl TuiApp {
                 let host_widgets = self.get_or_create_host_widgets(&hostname);
                 host_widgets.system_scroll_offset
             };
+            // Clone the config to avoid borrowing issues
+            let config = self.config.clone();
             let host_widgets = self.get_or_create_host_widgets(&hostname);
-            host_widgets.system_widget.render_with_scroll(frame, inner_area, scroll_offset, &hostname);
+            host_widgets.system_widget.render_with_scroll(frame, inner_area, scroll_offset, &hostname, Some(&config));
         }
     }