chore(dropzone): address feedback

Author: cdransf

2nd-gen/packages/core/components/dropzone/Dropzone.base.ts

@@ -209,15 +209,13 @@ export abstract class DropzoneBase extends SpectrumElement {
   // ──────────────────────────────
 
   /**
-   * Called when the `dragged` state changes. Subclasses override this to
+   * Called when the `dragged` state changes. Subclasses implement this to
    * update the shadow DOM status region for accessibility announcements.
    *
-   * @param _isDragged - `true` when drag enters; `false` when it leaves.
+   * @param isDragged - `true` when drag enters; `false` when it leaves.
    * @internal
    */
-  protected _onDragStateChange(_isDragged: boolean): void {
-    // Implemented in the concrete SWC class.
-  }
+  protected abstract _onDragStateChange(isDragged: boolean): void;
 
   /** @internal */
   private _clearDragLeaveTimer(): void {

2nd-gen/packages/core/components/dropzone/Dropzone.types.ts

@@ -39,3 +39,12 @@ export const SWC_DROPZONE_DRAGLEAVE_EVENT = 'swc-dropzone-dragleave';
 
 /** Fired when files are dropped on the drop zone. */
 export const SWC_DROPZONE_DROP_EVENT = 'swc-dropzone-drop';
+
+declare global {
+  interface GlobalEventHandlersEventMap {
+    [SWC_DROPZONE_SHOULD_ACCEPT_EVENT]: CustomEvent<DragEvent>;
+    [SWC_DROPZONE_DRAGOVER_EVENT]: CustomEvent<DragEvent>;
+    [SWC_DROPZONE_DRAGLEAVE_EVENT]: CustomEvent<DragEvent>;
+    [SWC_DROPZONE_DROP_EVENT]: CustomEvent<DragEvent>;
+  }
+}

2nd-gen/packages/swc/components/dropzone/Dropzone.ts

@@ -60,9 +60,7 @@ export class Dropzone extends DropzoneBase {
 
   public override connectedCallback(): void {
     super.connectedCallback();
-    if (!this.hasAttribute('role')) {
-      this.setAttribute('role', 'group');
-    }
+    this.setAttribute('role', 'group');
     if (window.__swc?.DEBUG) {
       this._warnMissingAccessibleName();
     }