chore(dropzone): extracted shared visually hidden class

Author: cdransf

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

@@ -14,6 +14,7 @@ import { CSSResultArray, html, PropertyValues, TemplateResult } from 'lit';
 
 import { DropzoneBase } from '@spectrum-web-components/core/components/dropzone';
 
+import visuallyHiddenStyles from '../../stylesheets/_lit-styles/visually-hidden.css';
 import styles from './dropzone.css';
 
 /**
@@ -49,7 +50,7 @@ import styles from './dropzone.css';
  */
 export class Dropzone extends DropzoneBase {
   public static override get styles(): CSSResultArray {
-    return [styles];
+    return [visuallyHiddenStyles, styles];
   }
 
   // ──────────────────────────
@@ -162,7 +163,11 @@ export class Dropzone extends DropzoneBase {
   protected override render(): TemplateResult {
     return html`
       <div class="swc-Dropzone">
-        <div role="status" aria-live="polite" class="swc-Dropzone-status"></div>
+        <div
+          role="status"
+          aria-live="polite"
+          class="swc-Dropzone-status swc-VisuallyHidden"
+        ></div>
         ${this.filled
           ? html`
               <slot name="filled-content"></slot>

2nd-gen/packages/swc/components/dropzone/dropzone.css

@@ -69,19 +69,6 @@
   text-align: center;
 }
 
-/* ─────────────────────────────────────
-   Visually-hidden status region
-   ───────────────────────────────────── */
-
-.swc-Dropzone-status {
-  position: absolute;
-  inline-size: 1px;
-  block-size: 1px;
-  white-space: nowrap;
-  overflow: hidden;
-  clip-path: inset(50%);
-}
-
 /* ─────────────────────────────────────
    Forced colors
    ───────────────────────────────────── */

2nd-gen/packages/swc/stylesheets/_lit-styles/visually-hidden.css

@@ -0,0 +1,21 @@
+/**
+ * Copyright 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+/* Hides an element visually while keeping it accessible to assistive technology. */
+.swc-VisuallyHidden {
+  position: absolute;
+  inline-size: 1px;
+  block-size: 1px;
+  white-space: nowrap;
+  overflow: hidden;
+  clip-path: inset(50%);
+}