make buttons functional

crates/components/src/system_display.rs

@@ -2,4 +2,14 @@ use bevy::prelude::*;
 
 /// System display component for showing detailed system information
 #[derive(Component)]
-pub struct SystemDisplay;
+pub struct SystemDisplay;
+
+/// Component for marking UI elements as system indicators
+#[derive(Component)]
+pub struct SystemIndicator {
+    pub system_id: String,
+}
+
+/// Component for marking the main system display area
+#[derive(Component)]
+pub struct SystemDisplayArea;