feat(workspace): bar above the phone keyboard to indent, outdent and move bullets

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/features/workspace/DocumentEditor.tsx

@@ -32,6 +32,7 @@ import { DocSyncEngine, EngineState } from '../../lib/docSync/engine';
 import { Presence } from '../../lib/docSync/transport';
 import { OutlinerTree, OutlinerTreeHandle } from './OutlinerTree';
 import { extractHashtags } from '../../lib/hashtags';
+import { moveSibling } from '../../lib/outlineList';
 
 export type DocSaveStatus = 'saved' | 'saving' | 'unsaved' | 'error';
 
@@ -704,6 +705,16 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
     [docId, canEdit, applyLocalBlocks]
   );
 
+  // Swaps a bullet (with its children) with the previous or next one on the same level, within the same
+  // parent. By id, not by index, so it also works while zoomed into a branch (the tree then sees a slice).
+  const handleMoveSibling = useCallback(
+    (blockId: string, direction: -1 | 1) => {
+      if (!canEdit) return;
+      applyLocalBlocks((prev) => moveSibling(prev, blockId, direction));
+    },
+    [canEdit, applyLocalBlocks]
+  );
+
   const handleMoveBlock = useCallback(
     (blockId: string, targetIndex: number, newLevel?: number) => {
       if (!canEdit) return;
@@ -1241,6 +1252,7 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
                 onInsertBlocks={handleInsertBlocks}
                 onDeleteBlock={handleDeleteBlock}
                 onMoveBlock={handleMoveBlock}
+                onMoveSibling={handleMoveSibling}
                 onOpenTask={onOpenTask}
                 onTagClick={onSelectTag}
                 onWikiLinkClick={onWikiLinkClick}
@@ -1338,6 +1350,7 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
               onInsertBlocks={handleInsertBlocks}
               onDeleteBlock={handleDeleteBlock}
               onMoveBlock={handleMoveBlock}
+                onMoveSibling={handleMoveSibling}
               onOpenTask={onOpenTask}
               onTagClick={onSelectTag}
               onWikiLinkClick={onWikiLinkClick}