[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>

browser_tests/tests/selectionToolboxSubmenus.spec.ts

@@ -85,7 +85,7 @@ test.describe('Selection Toolbox - More Options Submenus', () => {
     const initialShape = await nodeRef.getProperty<number>('shape')
 
     await openMoreOptions(comfyPage)
-    await comfyPage.page.getByText('Shape', { exact: true }).click()
+    await comfyPage.page.getByText('Shape', { exact: true }).hover()
     await expect(comfyPage.page.getByText('Box', { exact: true })).toBeVisible({
       timeout: 5000
     })
@@ -136,13 +136,18 @@ test.describe('Selection Toolbox - More Options Submenus', () => {
     comfyPage
   }) => {
     await openMoreOptions(comfyPage)
-    await expect(
-      comfyPage.page.getByText('Rename', { exact: true })
-    ).toBeVisible({ timeout: 5000 })
+    const renameItem = comfyPage.page.getByText('Rename', { exact: true })
+    await expect(renameItem).toBeVisible({ timeout: 5000 })
+
+    // Wait for multiple frames to allow PrimeVue's outside click handler to initialize
+    for (let i = 0; i < 30; i++) {
+      await comfyPage.nextFrame()
+    }
 
     await comfyPage.page
       .locator('#graph-canvas')
       .click({ position: { x: 0, y: 50 }, force: true })
+
     await comfyPage.nextFrame()
     await expect(
       comfyPage.page.getByText('Rename', { exact: true })