fix export bug

src/App.vue

@@ -32,7 +32,9 @@ async function openFolder() {
 
 async function exportBatch() {
     if (store.images.length === 0) return;
-    if (!store.watermarkSettings.text) {
+    
+    // Only require text if in ADD mode
+    if (store.editMode === 'add' && !store.watermarkSettings.text) {
         alert("请输入水印文字。");
         return;
     }
@@ -67,7 +69,8 @@ async function exportBatch() {
             await invoke('export_batch', {
                 images: exportTasks,
                 watermark: rustWatermarkSettings,
-                outputDir: outputDir
+                outputDir: outputDir,
+                mode: store.editMode
             });
             alert("批量导出完成！");
         }