components.dash (CounterTab.qml): a dash tab built on DashTabComponent. It hosts a DashWidgetGrid, so the dash Edit, Add widget, Reset and Clear All actions work on it. The Reset widget starts in the Add menu (enabled: false). + and - change the count.
components.dashCard (CounterCard.qml): an overview card built on DashCardComponent. Clicking it opens the tab. Left and Right change the count while it has focus.
components.widget (CounterWidget.qml): a bar pill. Left click toggles the dash on the counter tab, right click adds one. The same file works in a dock with no extra code.

The count is stored with setData("count", value) / savePluginData and read back through pluginData.count. Every surface reloads pluginData on pluginDataChanged, so they stay in sync.

Open the tab from a terminal with dms ipc call dash open plugin_dashCounterExample. If the tab is hidden from the tab bar it opens as a detail page with a back button.