feat: implement NodeLibrarySidebarTabV2 with Reka UI components (#8548)

## Summary

Implement a redesigned Node Library sidebar using Reka UI components
with virtualized tree rendering and improved UX.

## Changes

- **What**: 
  - Add three-tab structure (Essential, All, Custom) using Reka UI Tabs
- Implement TreeExplorerV2 with virtualized tree using
TreeRoot/TreeVirtualizer for performance
  - Add node hover preview with teleport to show NodePreview component
  - Implement context menu for toggling favorites on nodes
  - Add search functionality that auto-expands matching folders
- Create panel components: EssentialNodesPanel, AllNodesPanel,
CustomNodesPanel
  - Add 'Open Manager' button in CustomNodesPanel
  - Use custom icons: comfy--node for nodes, ph--folder-fill for folders
  - New node preview component: `NodePreviewCard`
  - Api node folder icon
  - Node drag preview

- **Feature Flag**: Enabled via URL parameter `?nodeRedesign=true`

## Review Focus

- TreeExplorerV2.vue uses `[...expandedKeys]` to prevent internal
mutation by Reka UI TreeRoot
- Context menu injection key is exported from TreeExplorerV2Node.vue and
imported by TreeExplorerV2.vue
- Hover preview uses teleport to
`#node-library-node-preview-container-v2`

## Screenshots (if applicable)

| Feature | Screenshot | 
|---|---|
| All nodes tab |<img width="323" height="761" alt="image"
src="https://github.com/user-attachments/assets/1976222b-83dc-4a1b-838a-2d49aedea3b8"
/>|
| Custom nodes tab | <img width="308" height="748" alt="image"
src="https://github.com/user-attachments/assets/2c23bffb-bdaa-4c6c-8cac-7610fb7f3fb7"
/>|
|Api nodes icon | <img width="299" height="523" alt="image"
src="https://github.com/user-attachments/assets/e9ca05b0-1143-44cf-b227-6462173c7cd0"
/>|
| node preview|<img width="499" height="544" alt="image"
src="https://github.com/user-attachments/assets/8961a7b4-77ae-4e57-99cf-62d9e4e17088"
/>|
| node drag preview | <img width="434" height="289" alt="image"
src="https://github.com/user-attachments/assets/b5838c90-65d4-4bee-b2b3-c41b57870da8"
/>|



Test by adding `?nodeRedesign=true` to the URL

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8548-WIP-feat-implement-NodeLibrarySidebarTabV2-with-Reka-UI-components-2fb6d73d36508134b7e0f75a2c9b976a)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: bymyself <cbyrne@comfy.org>

src/components/sidebar/tabs/NodeLibrarySidebarTabV2.vue

@@ -94,7 +94,7 @@
 </template>
 
 <script setup lang="ts">
-import { cn } from '@comfyorg/tailwind-utils'
+import { cn } from '@/utils/tailwindUtil'
 import { useLocalStorage } from '@vueuse/core'
 import {
   DropdownMenuContent,
@@ -114,6 +114,7 @@ import { useI18n } from 'vue-i18n'
 
 import SearchBox from '@/components/common/SearchBoxV2.vue'
 import { useNodeDragToCanvas } from '@/composables/node/useNodeDragToCanvas'
+import { usePerTabState } from '@/composables/usePerTabState'
 import {
   DEFAULT_SORTING_ID,
   DEFAULT_TAB_ID,
@@ -148,15 +149,7 @@ const sortOrderByTab = useLocalStorage<Record<TabId, SortingStrategyId>>(
     custom: 'alphabetical'
   }
 )
-const sortOrder = computed({
-  get: () => sortOrderByTab.value[selectedTab.value],
-  set: (value) => {
-    sortOrderByTab.value = {
-      ...sortOrderByTab.value,
-      [selectedTab.value]: value
-    }
-  }
-})
+const sortOrder = usePerTabState(selectedTab, sortOrderByTab)
 
 const sortingOptions = computed(() =>
   nodeOrganizationService.getSortingStrategies().map((strategy) => ({
@@ -174,12 +167,7 @@ const expandedKeysByTab = ref<Record<TabId, string[]>>({
   all: [],
   custom: []
 })
-const expandedKeys = computed({
-  get: () => expandedKeysByTab.value[selectedTab.value],
-  set: (value) => {
-    expandedKeysByTab.value[selectedTab.value] = value
-  }
-})
+const expandedKeys = usePerTabState(selectedTab, expandedKeysByTab)
 
 const nodeDefStore = useNodeDefStore()
 const { startDrag } = useNodeDragToCanvas()