[feat] Replace NodeOptions with PrimeVue ContextMenu (#7114)

## Summary
- Add `NodeContextMenu.vue` using PrimeVue ContextMenu component with
native submenu support
- Rename `SubmenuPopover.vue` to `ColorPickerMenu.vue` (specialized for
color picker)
- Delete old components: `NodeOptions.vue`, `MenuOptionItem.vue`,
`useSubmenuPositioning.ts`
- Wire up context menu converter in `useMoreOptionsMenu.ts`
- Update tests to use hover instead of click for submenus

## Dependencies
**This PR depends on #7113** - the context menu converter infrastructure
PR. It should be merged after that PR.

## Benefits
- Native PrimeVue submenu support with proper keyboard navigation
- Constrained menu dimensions with overflow scrolling (max-h-[80vh])
- Cleaner component architecture with ~280 fewer lines of code
- Better separation: ColorPickerMenu handles only the custom color
picker UI

## Test plan
- [x] Typecheck passes
- [x] Lint passes
- [x] Knip passes
- [ ] Browser tests for submenu interactions pass
- [ ] Manual testing of node context menu

## Screenshots
(Menu UI should look the same, with improved submenu behavior)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7114-feat-Replace-NodeOptions-with-PrimeVue-ContextMenu-2be6d73d365081fda576fd691175eacf)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/components/graph/GraphCanvas.vue

@@ -87,7 +87,6 @@
   <template v-if="comfyAppReady">
     <TitleEditor />
     <SelectionToolbox v-if="selectionToolboxEnabled" />
-    <NodeOptions />
     <!-- Render legacy DOM widgets only when Vue nodes are disabled -->
     <DomWidgets v-if="!shouldRenderVueNodes" />
   </template>
@@ -115,7 +114,6 @@ import GraphCanvasMenu from '@/components/graph/GraphCanvasMenu.vue'
 import NodeTooltip from '@/components/graph/NodeTooltip.vue'
 import SelectionToolbox from '@/components/graph/SelectionToolbox.vue'
 import TitleEditor from '@/components/graph/TitleEditor.vue'
-import NodeOptions from '@/components/graph/selectionToolbox/NodeOptions.vue'
 import NodePropertiesPanel from '@/components/rightSidePanel/RightSidePanel.vue'
 import NodeSearchboxPopover from '@/components/searchbox/NodeSearchBoxPopover.vue'
 import SideToolbar from '@/components/sidebar/SideToolbar.vue'