Install an HTML widget

1. Read the current selected page and its layout. Confirm the page is editable and has room.
2. Call addWidget with widgetType: "html". It uses the first fitting free cells. Read the returned widget ID and address. Do not invent a placement argument at insertion.
3. Use widgetMove and widgetResize with logical cell values if a different placement is needed. Check bounds and collision outcomes.
4. Patch the widget through a typed patchWidget action using its actual widgetAddress and values containing title, html, css, javascript, state or itemStates.
5. Set eventSubscriptions through its saved public JSON record or a preserved complete configuration replacement. That field is not a typed widget-patch field.
6. Read the saved widget and inspect its rendered page. Use a persisted bridge acknowledgement when testing event delivery.

Do not replace the full home with a one-widget example. Read and preserve the current configuration before a complete replacement. Source edits can recreate the WebView, so wait for dikciz-ready in widget JavaScript. State-only patches send dikciz-state or dikciz-item-state without reloading the document. Give reusable cards unique data-dikciz-item-id values and use selfWidget.itemFor(element) for their state and files.

HTML guide. Event receiver source.