refactor(ui)!: retire plugin-designer's dead collaboration code, VersionHistory and the useConfirmDialog entry line

The CollaborationProvider left the package entry in the previous batch and
nothing mounts it, so useCollaboration() is always null: delete the module
and the four designers' broadcast branches and status chips. VersionHistory
has no reader in the package or outside it: delete the module, its test and
its sub-barrel lines. useConfirmDialog stays module-local (seven designers
use it); only the entry and README stop publishing it.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsR2jR9JS6qCZyzC5esvUr

Author: claude

.changeset/25921-plugin-designer-dead-collaboration-version-history.md

@@ -0,0 +1,21 @@
+---
+'@object-ui/plugin-designer': patch
+---
+
+refactor(plugin-designer)!: retire `useConfirmDialog` and `VersionHistory` from the entry, and delete the designers' dead collaboration code
+
+Clause-②: yes
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (runtime-export-retired @object-ui/plugin-designer#useConfirmDialog, @object-ui/plugin-designer#VersionHistory) the retired operands are a React hook and a React component in a published ui package's entry that nothing in the workspace or in hotcrm imported; no packages/spec schema, registered node type, ADR-0087 conversion surface or stored shape names them, so there is nothing for `objectstack migrate meta` to rewrite -->
+
+**BREAKING** for a host that imports `useConfirmDialog` or `VersionHistory` from `@object-ui/plugin-designer`. Neither had an importer anywhere in the workspace or in hotcrm, so the Console and every `@object-ui/*` package are unaffected.
+
+- The `VersionHistory` timeline module is deleted: nothing in the package rendered it. The `designer.versionHistory` translation key stays in the locale packs for now, with no reader.
+- `useConfirmDialog` stays inside the package, because the designers use it for their delete prompts. Only the entry stops publishing it.
+- The collaboration code that became unreachable once the previous release stopped exporting `CollaborationProvider` is deleted. That covers the provider module, the always-null `useCollaboration()` branches in the page, data model, process and report designers, and their "N users" / "Connected" toolbar chips. Nothing outside the package could mount the provider, so no designer behaves differently.
+
+What leaves, and what to write instead (neither has a replacement export):
+
+- FROM `useConfirmDialog` TO no replacement: render your own confirm prompt with `ConfirmDialog` (still exported) and local `useState`.
+- FROM `VersionHistory` TO no replacement: render the version list in your own component. The designers never showed one.

ui/packages/plugin-designer/README.md

@@ -125,18 +125,17 @@ declare const sections: ReportDesignerSection[];
 ### Shared Hooks
 
 ```tsx
-import { useUndoRedo, useConfirmDialog } from '@object-ui/plugin-designer';
+import { useUndoRedo } from '@object-ui/plugin-designer';
 
 import type { DesignerComponent } from '@object-ui/types';
 
 const { undo, redo, canUndo, canRedo } = useUndoRedo<DesignerComponent[]>([]);
-const { confirm, isOpen } = useConfirmDialog();
 ```
 
 ### Shared Components
 
 ```tsx
-import { ConfirmDialog, Minimap, VersionHistory } from '@object-ui/plugin-designer';
+import { ConfirmDialog, Minimap } from '@object-ui/plugin-designer';
 ```
 
 ## Links

ui/packages/plugin-designer/package.json

@@ -3,7 +3,7 @@
   "version": "18.2.0",
   "type": "module",
   "license": "MIT",
-  "description": "Visual designer plugin for ObjectUI with page, data model, process, and report designers plus collaborative editing.",
+  "description": "Visual designer plugin for ObjectUI with page, data model, process, and report designers.",
   "main": "dist/index.umd.cjs",
   "module": "dist/index.js",
   "types": "dist/index.d.ts",

ui/packages/plugin-designer/src/CollaborationProvider.tsx

@@ -8,7 +8,7 @@
 
 import React, { useState, useCallback, useEffect, useRef } from 'react';
 import type { DataModelEntity, DataModelField, DataModelRelationship, DesignerCanvasConfig } from '@object-ui/types';
-import { Database, Plus, Trash2, Link2, Undo2, Redo2, Grid3X3, ZoomIn, ZoomOut, RotateCcw, ChevronDown, ChevronRight, Copy, Clipboard, Users } from 'lucide-react';
+import { Database, Plus, Trash2, Link2, Undo2, Redo2, Grid3X3, ZoomIn, ZoomOut, RotateCcw, ChevronDown, ChevronRight, Copy, Clipboard } from 'lucide-react';
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@object-ui/components';
 import { clsx } from 'clsx';
 import { twMerge } from 'tailwind-merge';
@@ -20,7 +20,6 @@ import { useCanvasPanZoom } from './hooks/useCanvasPanZoom';
 import { ConfirmDialog } from './components/ConfirmDialog';
 import { PropertyEditor, type PropertyField } from './components/PropertyEditor';
 import { Minimap } from './components/Minimap';
-import { useCollaboration } from './CollaborationProvider';
 import { CANVAS_BACKGROUND_CLASS, canvasBackgroundStyle } from './canvasBackground';
 
 function cn(...inputs: (string | undefined | false)[]) {
@@ -253,7 +252,7 @@ export interface DataModelDesignerProps {
  * rows of its `sourceField` and `targetField`, with its `deleteBehavior` beside
  * the label (objectui#11434).
  * Supports undo/redo, multi-select, copy/paste, pan/zoom, drag-to-reposition,
- * inline field editing, property editor, minimap, auto-layout, and collaboration.
+ * inline field editing, property editor, minimap and auto-layout.
  */
 export function DataModelDesigner({
   entities: initialEntities = [],
@@ -300,9 +299,6 @@ export function DataModelDesigner({
   // --- Pan/Zoom ---
   const panZoom = useCanvasPanZoom({ minZoom: 0.25, maxZoom: 3, zoomStep: 0.1 });
 
-  // --- Collaboration ---
-  const collaboration = useCollaboration();
-
   // --- Collapsible panels ---
   const [showProperties, setShowProperties] = useState(true);
   const [showMinimap, setShowMinimap] = useState(true);
@@ -343,8 +339,7 @@ export function DataModelDesigner({
     };
     pushState(next);
     multiSelect.selectOne(newEntity.id);
-    collaboration?.sendOperation({ type: 'insert', userId: collaboration?.currentUserId ?? '', elementId: newEntity.id, data: { name: newEntity.name, label: newEntity.label } });
-  }, [readOnly, undoRedo, pushState, multiSelect, collaboration]);
+  }, [readOnly, undoRedo, pushState, multiSelect]);
 
   const handleDeleteEntity = useCallback(
     async (id: string) => {
@@ -367,9 +362,8 @@ export function DataModelDesigner({
       if (multiSelect.isSelected(id)) {
         multiSelect.clearSelection();
       }
-      collaboration?.sendOperation({ type: 'delete', userId: collaboration?.currentUserId ?? '', elementId: id, data: {} });
     },
-    [readOnly, entities, confirmDialog, undoRedo, pushState, multiSelect, collaboration],
+    [readOnly, entities, confirmDialog, undoRedo, pushState, multiSelect],
   );
 
   const handleDeleteSelected = useCallback(async () => {
@@ -788,14 +782,6 @@ export function DataModelDesigner({
 
           <div className="flex-1" />
 
-          {/* Collaboration status */}
-          {collaboration?.isConnected && (
-            <div className="flex items-center gap-1 text-xs text-muted-foreground" role="status" aria-label="Collaboration active">
-              <Users className="h-3 w-3" />
-              <span>{collaboration.users.length} user{collaboration.users.length !== 1 ? 's' : ''}</span>
-            </div>
-          )}
-
           {/* Multi-select count */}
           {multiSelect.count > 1 && (
             <span className="text-xs text-muted-foreground">{multiSelect.count} selected</span>