fix: right-click context menu disabled when selection toolbox is off (#8781)

## Summary

- Move `NodeContextMenu` from `SelectionToolbox.vue` to
`GraphCanvas.vue` so the right-click context menu renders independently
of the `Comfy.Canvas.SelectionToolbox` setting

- Fixes #8417

## Test plan

- [x] Disable selection toolbox in settings, right-click a node —
context menu appears
- [x] Enable selection toolbox, right-click a node — context menu still
appears
- [x] `pnpm typecheck` passes
- [x] `pnpm lint` passes

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8781-fix-right-click-context-menu-disabled-when-selection-toolbox-is-off-3036d73d36508168a9add58e060b7e93)
by [Unito](https://www.unito.io)

src/components/graph/GraphCanvas.vue

@@ -94,6 +94,7 @@
   <template v-if="comfyAppReady">
     <TitleEditor />
     <SelectionToolbox v-if="selectionToolboxEnabled" />
+    <NodeContextMenu />
     <!-- Render legacy DOM widgets only when Vue nodes are disabled -->
     <DomWidgets v-if="!shouldRenderVueNodes" />
   </template>
@@ -121,6 +122,7 @@ import DomWidgets from '@/components/graph/DomWidgets.vue'
 import GraphCanvasMenu from '@/components/graph/GraphCanvasMenu.vue'
 import LinkOverlayCanvas from '@/components/graph/LinkOverlayCanvas.vue'
 import NodeTooltip from '@/components/graph/NodeTooltip.vue'
+import NodeContextMenu from '@/components/graph/NodeContextMenu.vue'
 import SelectionToolbox from '@/components/graph/SelectionToolbox.vue'
 import TitleEditor from '@/components/graph/TitleEditor.vue'
 import NodePropertiesPanel from '@/components/rightSidePanel/RightSidePanel.vue'

src/components/graph/SelectionToolbox.vue

@@ -42,7 +42,6 @@
       </Panel>
     </Transition>
   </div>
-  <NodeContextMenu />
 </template>
 
 <script setup lang="ts">
@@ -69,7 +68,6 @@ import { useExtensionService } from '@/services/extensionService'
 import { useCommandStore } from '@/stores/commandStore'
 import type { ComfyCommandImpl } from '@/stores/commandStore'
 
-import NodeContextMenu from './NodeContextMenu.vue'
 import FrameNodes from './selectionToolbox/FrameNodes.vue'
 import NodeOptionsButton from './selectionToolbox/NodeOptionsButton.vue'
 import VerticalDivider from './selectionToolbox/VerticalDivider.vue'