feat: 图片工作台/镜头实验室/局部重绘/数字人/去水印页面UI优化

src/features/digital-human/DigitalHumanPage.tsx

@@ -567,7 +567,17 @@ function DigitalHumanPage({
                 </button>
               )}
               {resultVideoUrl && (
-                <div className="studio-result-actions studio-result-actions--with-clear">
+                <button type="button" className="studio-generate-btn" onClick={() => {
+                  setResultVideoUrl("");
+                  setActiveTaskId("");
+                  setTaskProgress(0);
+                  setNotice("已清空工作区");
+                }}>
+                  清空
+                </button>
+              )}
+              {resultVideoUrl && (
+                <div className="studio-result-actions">
                   <button type="button" onClick={() => void handleDownloadResult()} disabled={isDownloadingResult}>
                     <DownloadOutlined />
                     {isDownloadingResult ? "保存中" : "保存本地"}
@@ -576,14 +586,6 @@ function DigitalHumanPage({
                     <InboxOutlined />
                     {isSavingResultAsset ? "加入中" : "加入资产库"}
                   </button>
-                  <button type="button" onClick={() => {
-                    setResultVideoUrl("");
-                    setActiveTaskId("");
-                    setTaskProgress(0);
-                    setNotice("已清空工作区");
-                  }}>
-                    清空
-                  </button>
                 </div>
               )}
             </div>