fix(ui): show empty folders as move and download destinations (#999)

static/js/api/baseModelApi.js

@@ -1206,9 +1206,13 @@ export class BaseModelApiClient {
         }
     }
 
-    async fetchUnifiedFolderTree() {
+    async fetchUnifiedFolderTree(options = {}) {
         try {
-            const response = await fetch(this.apiConfig.endpoints.unifiedFolderTree);
+            const { includeEmpty = false } = options;
+            const url = includeEmpty
+                ? `${this.apiConfig.endpoints.unifiedFolderTree}?include_empty=1`
+                : this.apiConfig.endpoints.unifiedFolderTree;
+            const response = await fetch(url);
             if (!response.ok) {
                 throw new Error(`Failed to fetch unified folder tree`);
             }

static/js/managers/DownloadManager.js

@@ -2134,8 +2134,9 @@ export class DownloadManager {
 
     async initializeFolderTree() {
         try {
-            // Fetch unified folder tree
-            const treeData = await this.apiClient.fetchUnifiedFolderTree();
+            // Fetch unified folder tree, including empty directories so they
+            // can be selected as download destinations
+            const treeData = await this.apiClient.fetchUnifiedFolderTree({ includeEmpty: true });
 
             if (treeData.success) {
                 // Load tree data into folder tree manager

static/js/managers/MoveManager.js

@@ -200,8 +200,9 @@ class MoveManager {
     async initializeFolderTree() {
         try {
             const apiClient = this._getApiClient();
-            // Fetch unified folder tree
-            const treeData = await apiClient.fetchUnifiedFolderTree();
+            // Fetch unified folder tree, including empty directories so they
+            // can be selected as move targets
+            const treeData = await apiClient.fetchUnifiedFolderTree({ includeEmpty: true });
 
             if (treeData.success) {
                 // Load tree data into folder tree manager