[feat] Restore group node conversion menu with deprecated label (#4967)

## Summary
- Partially reverts commit c84218d6 to restore group node functionality
in context menus
- Adds "(Deprecated)" label to indicate the feature is deprecated
- Fixes TypeError when right-clicking on group nodes
- Re-enables tests that were disabled when the feature was removed

## Changes
1. **Restored context menu options** - Added back "Convert to Group Node
(Deprecated)" and "Manage Group Nodes" menu items
2. **Fixed null reference error** - Added null-safe operator to prevent
errors when right-clicking group nodes
3. **Re-enabled tests** - Restored 7 tests that were disabled in commit
586f8824

## Test plan
- [x] Right-click on canvas → verify "Convert to Group Node
(Deprecated)" appears
- [x] Right-click on nodes → verify the same menu option appears
- [x] Select multiple nodes and use the menu option → verify conversion
works
- [x] Right-click on group nodes → verify no errors occur
- [x] Run browser tests → verify all re-enabled tests pass

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-4967-feat-Restore-group-node-conversion-menu-with-deprecated-label-24e6d73d36508149a6f2dbef47223e94)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: github-actions <github-actions@github.com>

src/extensions/core/groupNode.ts

@@ -3,6 +3,7 @@ import { type NodeId } from '@/lib/litegraph/src/LGraphNode'
 import {
   type ExecutableLGraphNode,
   type ExecutionId,
+  LGraphCanvas,
   LGraphNode,
   LiteGraph,
   SubgraphNode
@@ -1172,8 +1173,7 @@ export class GroupNodeHandler {
       // @ts-expect-error fixme ts strict error
       getExtraMenuOptions?.apply(this, arguments)
 
-      // @ts-expect-error fixme ts strict error
-      let optionIndex = options.findIndex((o) => o.content === 'Outputs')
+      let optionIndex = options.findIndex((o) => o?.content === 'Outputs')
       if (optionIndex === -1) optionIndex = options.length
       else optionIndex++
       options.splice(
@@ -1634,6 +1634,57 @@ export class GroupNodeHandler {
   }
 }
 
+function addConvertToGroupOptions() {
+  // @ts-expect-error fixme ts strict error
+  function addConvertOption(options, index) {
+    const selected = Object.values(app.canvas.selected_nodes ?? {})
+    const disabled =
+      selected.length < 2 ||
+      selected.find((n) => GroupNodeHandler.isGroupNode(n))
+    options.splice(index, null, {
+      content: `Convert to Group Node (Deprecated)`,
+      disabled,
+      callback: convertSelectedNodesToGroupNode
+    })
+  }
+
+  // @ts-expect-error fixme ts strict error
+  function addManageOption(options, index) {
+    const groups = app.graph.extra?.groupNodes
+    const disabled = !groups || !Object.keys(groups).length
+    options.splice(index, null, {
+      content: `Manage Group Nodes`,
+      disabled,
+      callback: () => manageGroupNodes()
+    })
+  }
+
+  // Add to canvas
+  const getCanvasMenuOptions = LGraphCanvas.prototype.getCanvasMenuOptions
+  LGraphCanvas.prototype.getCanvasMenuOptions = function () {
+    // @ts-expect-error fixme ts strict error
+    const options = getCanvasMenuOptions.apply(this, arguments)
+    const index = options.findIndex((o) => o?.content === 'Add Group')
+    const insertAt = index === -1 ? options.length - 1 : index + 2
+    addConvertOption(options, insertAt)
+    addManageOption(options, insertAt + 1)
+    return options
+  }
+
+  // Add to nodes
+  const getNodeMenuOptions = LGraphCanvas.prototype.getNodeMenuOptions
+  LGraphCanvas.prototype.getNodeMenuOptions = function (node) {
+    // @ts-expect-error fixme ts strict error
+    const options = getNodeMenuOptions.apply(this, arguments)
+    if (!GroupNodeHandler.isGroupNode(node)) {
+      const index = options.findIndex((o) => o?.content === 'Properties')
+      const insertAt = index === -1 ? options.length - 1 : index
+      addConvertOption(options, insertAt)
+    }
+    return options
+  }
+}
+
 const replaceLegacySeparators = (nodes: ComfyNode[]): void => {
   for (const node of nodes) {
     if (typeof node.type === 'string' && node.type.startsWith('workflow/')) {
@@ -1729,6 +1780,9 @@ const ext: ComfyExtension = {
       }
     }
   ],
+  setup() {
+    addConvertToGroupOptions()
+  },
   async beforeConfigureGraph(
     graphData: ComfyWorkflowJSON,
     missingNodeTypes: string[]