feat: implement NodeLibrarySidebarTabV2 with Reka UI components

- Add three-tab structure (Essential, All, Custom) using Reka UI Tabs
- Implement TreeExplorerV2 with virtualized tree using TreeRoot/TreeVirtualizer
- 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

Co-authored-by: Amp <amp@ampcode.com>
Amp-Thread-ID: https://ampcode.com/threads/T-019c1ee5-bb3c-70fb-8c24-33966d8dbef8

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,

src/types/nodeSource.ts

@@ -124,6 +124,14 @@ export const getNodeSource = (
       displayText: displayName,
       badgeText: displayName
     }
+  } else if (modules[0] === 'essential') {
+    const moduleName = modules[1]
+    return {
+      type: NodeSourceType.Essentials,
+      className: 'comfy-essentials',
+      displayText: moduleName,
+      badgeText: moduleName
+    }
   } else {
     return UNKNOWN_NODE_SOURCE
   }