feat(outliner): indent and outdent entire subtree with all children on Tab and Shift+Tab

frontend/src/features/workspace/DocumentEditor.tsx

@@ -1029,6 +1029,25 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
     [effectiveCanEdit, isLiveEnabled, sendBlockUpdated]
   );
 
+  const handleUpdateBlocks = useCallback(
+    (updatedBlocks: DocumentBlock[]) => {
+      if (!effectiveCanEdit || updatedBlocks.length === 0) return;
+      const map = new Map<string, DocumentBlock>();
+      for (const b of updatedBlocks) {
+        map.set(b.id, b);
+      }
+      setBlocks((prev) =>
+        prev.map((b) => map.get(b.id) || b)
+      );
+      if (isLiveEnabled) {
+        for (const b of updatedBlocks) {
+          sendBlockUpdated(b);
+        }
+      }
+    },
+    [effectiveCanEdit, isLiveEnabled, sendBlockUpdated]
+  );
+
   const handleCreateBlock = useCallback(
     (newBlock: DocumentBlock, afterBlockId?: string) => {
       if (!effectiveCanEdit) return;
@@ -1531,6 +1550,7 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
                 remoteCursors={remoteCursors}
                 sendCursorMoved={sendCursorMoved}
                 onUpdateBlock={handleUpdateBlock}
+                onUpdateBlocks={handleUpdateBlocks}
                 onCreateBlock={handleCreateBlock}
                 onDeleteBlock={handleDeleteBlock}
                 onMoveBlock={handleMoveBlock}
@@ -1599,6 +1619,7 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
               remoteCursors={remoteCursors}
               sendCursorMoved={sendCursorMoved}
               onUpdateBlock={handleUpdateBlock}
+              onUpdateBlocks={handleUpdateBlocks}
               onCreateBlock={handleCreateBlock}
               onDeleteBlock={handleDeleteBlock}
               onMoveBlock={handleMoveBlock}