feat: Add shift-click additive selection for documents in grid view

frontend/src/documents/hooks/useDocumentItemLogic.ts

@@ -9,6 +9,7 @@ import type { Identifier } from '../../types/identifiers';
 interface UseDocumentItemLogicProps extends DocumentsViewProps {
     doc: Document;
     viewLogic: DocumentViewLogic;
+    onEntryPointer?: (entry: any, event: any) => void;
 }
 
 export const useDocumentItemLogic = (props: UseDocumentItemLogicProps) => {
@@ -55,8 +56,12 @@ export const useDocumentItemLogic = (props: UseDocumentItemLogicProps) => {
 
     const handlers = {
         onClick: (event: React.MouseEvent) => {
-            const key = createDocumentEntryKey(doc.id);
-            handleEntrySelection(key, event);
+            if (props.onEntryPointer) {
+                props.onEntryPointer({ type: 'document', id: doc.id, key: createDocumentEntryKey(doc.id), document: doc }, event);
+            } else {
+                const key = createDocumentEntryKey(doc.id);
+                handleEntrySelection(key, event);
+            }
         },
         onDoubleClick: (event: React.MouseEvent) => onDocumentActivate?.(doc, event),
         onDragStart: (event: DragEvent<HTMLElement>) => onDocumentDragStart?.(event, doc),

frontend/src/documents/panel/DocumentsPanel.tsx

@@ -465,6 +465,7 @@ const DocumentsPanelInner: React.FC<DocumentsPanelInnerProps> = ({
     onCorrespondentClick: toggleCorrespondentFilter,
     tenantId: currentTenantId,
     viewId,
+    onEntryPointer,
   };
 
   const renderBody = () => {

frontend/src/hooks/documents/useDocumentsWorkspace.ts

@@ -1141,7 +1141,13 @@ const useDocumentsWorkspace = ({
       const key = rowKey
         || (type === EntryType.document ? createDocumentEntryKey(id) : createFolderEntryKey(id));
       if (key) {
-        handleEntrySelection(key, event);
+        if (documentsViewMode === 'grid' && (event as any).shiftKey) {
+          // Additive selection for Shift+Click in Grid View
+          const newSelection = Array.from(new Set([...selectedEntries, key]));
+          applySelection(newSelection, { anchor: key, interactedKeys: [key] });
+        } else {
+          handleEntrySelection(key, event);
+        }
       }
       if (type === EntryType.folder && !modifierClick && primaryClick) {
         selectFolder(id);