remove demo game

ui.manager.go

@@ -0,0 +1,26 @@
+package pncdsl
+
+// UIManager registers Widget instances. Same shape as every other manager.
+type UIManager = Manager[Widget]
+
+// reversedWidgets iterates a manager's contents in reverse registration
+// order — used by the engine for top-down input dispatch (the widget
+// drawn on top gets the click first).
+func reversedWidgets(m *UIManager) []Widget {
+	names := m.Names()
+	out := make([]Widget, len(names))
+	for i, n := range names {
+		out[len(names)-1-i] = m.MustGet(n)
+	}
+	return out
+}
+
+// orderedWidgets iterates in registration order — bottom-up draw.
+func orderedWidgets(m *UIManager) []Widget {
+	names := m.Names()
+	out := make([]Widget, len(names))
+	for i, n := range names {
+		out[i] = m.MustGet(n)
+	}
+	return out
+}