N°8641 - Dashboard editor front-end first commit for Form SDK integration.

* No dashlet edition
* Dashboard are not persisted
* Unable to load a dashboard from an endpoint (refresh)
* Grid library need proper npm integration

node_modules/gridstack/dist/dd-element.d.ts

@@ -0,0 +1,27 @@
+/**
+ * dd-elements.ts 12.3.2
+ * Copyright (c) 2021-2025 Alain Dumesny - see GridStack root license
+ */
+import { DDResizable, DDResizableOpt } from './dd-resizable';
+import { DDDragOpt, GridItemHTMLElement } from './types';
+import { DDDraggable } from './dd-draggable';
+import { DDDroppable, DDDroppableOpt } from './dd-droppable';
+export interface DDElementHost extends GridItemHTMLElement {
+    ddElement?: DDElement;
+}
+export declare class DDElement {
+    el: DDElementHost;
+    static init(el: DDElementHost): DDElement;
+    ddDraggable?: DDDraggable;
+    ddDroppable?: DDDroppable;
+    ddResizable?: DDResizable;
+    constructor(el: DDElementHost);
+    on(eventName: string, callback: (event: MouseEvent) => void): DDElement;
+    off(eventName: string): DDElement;
+    setupDraggable(opts: DDDragOpt): DDElement;
+    cleanDraggable(): DDElement;
+    setupResizable(opts: DDResizableOpt): DDElement;
+    cleanResizable(): DDElement;
+    setupDroppable(opts: DDDroppableOpt): DDElement;
+    cleanDroppable(): DDElement;
+}