fix: RESOLVE_FOLDER_ITEMS appends new items for DropzoneDnD folder drops

When dropping a folder via DropzoneDnD, directory entries have file=null
so buildPreliminaryItems filters them out. flattenEntries then discovers
the actual files inside. The RESOLVE_FOLDER_ITEMS reducer now appends
items whose fileId doesn't exist in the queue yet, instead of only
updating existing ones.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Crash--

src/modules/upload/index.js

@@ -156,10 +156,18 @@ export const queue = (state = [], action) => {
       return []
     case RESOLVE_FOLDER_ITEMS: {
       const resolved = action.resolvedItems
-      return state.map(i => {
+      const existingIds = new Set(state.map(i => i.fileId))
+      // Update existing items + append new ones (DropzoneDnD: directory
+      // entries have file=null so buildPreliminaryItems filters them out,
+      // flattenEntries discovers the actual files inside)
+      const updated = state.map(i => {
         const update = resolved.find(r => r.fileId === i.fileId)
         return update ? { ...i, ...update } : i
       })
+      const newItems = resolved
+        .filter(r => !existingIds.has(r.fileId))
+        .map(r => itemInitialState(r))
+      return [...updated, ...newItems]
     }
     case UPLOAD_FILE:
     case RECEIVE_UPLOAD_SUCCESS:

src/modules/upload/index.spec.js

@@ -368,6 +368,39 @@ describe('queue reducer', () => {
     expect(result).toEqual([])
   })
 
+  it('should update existing items and append new ones on RESOLVE_FOLDER_ITEMS', () => {
+    const initialState = [
+      {
+        fileId: 'report.pdf',
+        status: 'pending',
+        file: { name: 'report.pdf' },
+        progress: null
+      }
+    ]
+    const action = {
+      type: 'RESOLVE_FOLDER_ITEMS',
+      resolvedItems: [
+        {
+          fileId: 'report.pdf',
+          file: { name: 'report.pdf' },
+          folderId: 'resolved-dir',
+          relativePath: null
+        },
+        {
+          fileId: 'photos/img.jpg',
+          file: { name: 'img.jpg' },
+          folderId: 'photos-dir',
+          relativePath: 'photos/img.jpg'
+        }
+      ]
+    }
+    const result = queue(initialState, action)
+    expect(result).toHaveLength(2)
+    expect(result[0].folderId).toBe('resolved-dir')
+    expect(result[1].fileId).toBe('photos/img.jpg')
+    expect(result[1].status).toBe('pending')
+  })
+
   it('should handle PURGE_UPLOAD_QUEUE action type', () => {
     const action = {
       type: 'PURGE_UPLOAD_QUEUE'