The very basic client app, not adapted for mobiles.

client/internal/services/core/options/dto/option_pane.go

@@ -0,0 +1,14 @@
+package dto
+
+import "fyne.io/fyne/v2"
+
+// OptionPane is a DTO for registering options pane.
+type OptionPane struct {
+	Widget      fyne.CanvasObject
+	SaveHandler OptionSaveHandler
+	Name        string
+}
+
+// OptionSaveHandler is a signature for functions responsible for saving options, resides in service that registers own
+// options pane.
+type OptionSaveHandler func() error