feat: DownloadAction for the action trigger framework#24432
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Replace appendStatement(JsBuilder, StringBuilder) on Action with render(JsBuilder): JsFunction. Replace Input.appendExpression with Input.toJs(JsBuilder): JsFunction returning the input's value when invoked. Each Action ships as its own JsFunction (body + captures); Trigger composes them as captures of a tiny parent JsFunction whose body is just $0(event);$1(event);... PromiseAction wraps the subclass JsFunction with OBSERVE_PROMISE via captures instead of string concatenation. Eliminates hand-escaped JS literals in action bodies — strings and Element refs go through JsFunction's capture mechanism, which Jackson- encodes on the wire. Removes the "this" special-case for the host element: the host is captured the same way as any other Element. JsBuilder shrinks to just the render-time context (trigger() accessor) plus a static json() helper kept for Trigger.installJs() (a raw String, not a JsFunction).
Starts a file download in the browser when a trigger fires, using a synthesised <a href download> click inside the gesture. Three flavours: a static URL (optionally with a filename), a DownloadHandler whose stream resource is wired through Element.setAttribute (same lifecycle as Image.setSrc / Anchor.setHref), and an Action.Input<String> for URLs resolved on the client at fire time. No outcome callback — browsers do not report download completion.
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Starts a file download in the browser when a trigger fires, using a
synthesised click inside the gesture. Three flavours:
a static URL (optionally with a filename), a DownloadHandler whose
stream resource is wired through Element.setAttribute (same lifecycle
as Image.setSrc / Anchor.setHref), and an Action.Input for URLs
resolved on the client at fire time. No outcome callback — browsers do
not report download completion.