fix(chat): fix effectAllowed, stale atInsertPosRef, and drag-enter overlay for resource drags

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx

@@ -307,6 +307,8 @@ export function UserInput({
           for (const resource of resources) {
             handleResourceSelect(resource)
           }
+          // Reset after batch so the next non-drop insert uses the cursor position
+          atInsertPosRef.current = null
         } catch {
           // Invalid JSON — ignore
         }
@@ -319,6 +321,7 @@ export function UserInput({
         try {
           const resource = JSON.parse(resourceJson) as MothershipResource
           handleResourceSelect(resource)
+          atInsertPosRef.current = null
         } catch {
           // Invalid JSON — ignore
         }
@@ -330,11 +333,17 @@ export function UserInput({
   )
 
   const handleDragEnter = useCallback((e: React.DragEvent) => {
-    filesRef.current.handleDragEnter(e)
+    const isResourceDrag =
+      e.dataTransfer.types.includes(SIM_RESOURCE_DRAG_TYPE) ||
+      e.dataTransfer.types.includes(SIM_RESOURCES_DRAG_TYPE)
+    if (!isResourceDrag) filesRef.current.handleDragEnter(e)
   }, [])
 
   const handleDragLeave = useCallback((e: React.DragEvent) => {
-    filesRef.current.handleDragLeave(e)
+    const isResourceDrag =
+      e.dataTransfer.types.includes(SIM_RESOURCE_DRAG_TYPE) ||
+      e.dataTransfer.types.includes(SIM_RESOURCES_DRAG_TYPE)
+    if (!isResourceDrag) filesRef.current.handleDragLeave(e)
   }, [])
 
   const handleFileChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components/workflow-list/components/folder-item/folder-item.tsx

@@ -198,7 +198,7 @@ export function FolderItem({
           }
 
       e.dataTransfer.setData('sidebar-selection', JSON.stringify(selection))
-      e.dataTransfer.effectAllowed = 'move'
+      e.dataTransfer.effectAllowed = 'copyMove'
 
       const resources = buildDragResources(selection, workspaceId)
       if (resources.length > 0) {

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components/workflow-list/components/workflow-item/workflow-item.tsx

@@ -339,7 +339,7 @@ export function WorkflowItem({
           }
 
       e.dataTransfer.setData('sidebar-selection', JSON.stringify(selection))
-      e.dataTransfer.effectAllowed = 'move'
+      e.dataTransfer.effectAllowed = 'copyMove'
 
       const resources = buildDragResources(selection, workspaceId)
       if (resources.length > 0) {