fix(32): CR-04 take widget actions dispatched from connectedCallback

WidgetField assigned its element after append(), so an action the element
dispatched from connectedCallback (inside append) found no target and was
dropped without a result or an error state; widgets that load on connect
never started. The element is now the action target before it is connected.
Rebuilt the embedded admin dist.

docs/backend/partials-and-widgets.md

@@ -83,7 +83,7 @@ The SPA talks to the plugin element through attributes and two events, nothing e
 
 The events:
 
-- `summer-action` is dispatched by the element (with `bubbles` and `composed`) to ask for its action. Its optional `detail.payload` is any JSON value; the SPA posts it as `payload`. A detail without a `payload` property sends none.
+- `summer-action` is dispatched by the element (with `bubbles` and `composed`) to ask for its action. Its optional `detail.payload` is any JSON value; the SPA posts it as `payload`. A detail without a `payload` property sends none. The SPA listens before it connects the element, so an action dispatched from `connectedCallback` (a first load, for example) is taken; one dispatched while `busy` is set is dropped, so wait for `busy` to clear before asking again.
 - `summer-result` is dispatched by the SPA on the element after a successful action, with `detail` `{data, fill, message}`: the response data as returned (`undefined` when none), the fill object and the message. A failed action dispatches nothing.
 
 The element never receives a token, a cookie, a Vue instance or a function, and it must not make requests of its own: the SPA owns HTTP and the admin session. Render server data with `textContent`, not `innerHTML`: `data` is the plugin's own answer, but it still came over the wire. The `acme-demo-lookup` fixture under `modules/cabana/testdata/extension/assets/js/lookup.js` is a complete reorder widget: a click sends the new id order as the payload and the returned item list is rendered from the `data` attribute and the `summer-result` event.