Make every settings row reachable, and every accessibility switch honest

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/modules/settings/OptionPickerRow.qml

@@ -68,6 +68,18 @@ PickerRow {
             controlWidth: 90
             divider: index < root.options.length - 1
             activatable: modelData.value !== root.current
+
+            // An option in an open list, not a button: the reader should say
+            // which one is already chosen. The current option is deliberately
+            // not activatable and so not a Tab stop -- picking what is already
+            // picked is not a thing to walk to.
+            activeFocusOnTab: modelData.value !== root.current
+
+            Accessible.role: Accessible.RadioButton
+            Accessible.name: String(modelData.label ?? "")
+            Accessible.description: String(modelData.detail ?? "")
+            Accessible.checked: modelData.value === root.current
+
             onActivated: {
                 root.picked(modelData.value);
                 root.collapse();