V2 Node Search (+ hidden Node Library changes) (#8987)

## Summary

Redesigned node search with categories

## Changes

- **What**: Adds a v2 search component, leaving the existing
implementation untouched
- It also brings onboard the incomplete node library & preview changes,
disabled and behind a hidden setting
- **Breaking**: Changes the 'default' value of the node search setting
to v2, adding v1 (legacy) as an option

## Screenshots (if applicable)




https://github.com/user-attachments/assets/2ab797df-58f0-48e8-8b20-2a1809e3735f

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8987-V2-Node-Search-hidden-Node-Library-changes-30c6d73d36508160902bcb92553f147c)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Yourz <crazilou@vip.qq.com>
Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Christian Byrne <cbyrne@comfy.org>

src/components/searchbox/NodeSearchBox.vue

@@ -5,7 +5,7 @@
     <div
       v-if="enableNodePreview && hoveredSuggestion"
       class="comfy-vue-node-preview-container absolute top-[50px] left-[-375px] z-50 cursor-pointer"
-      @mousedown.stop="onAddNode(hoveredSuggestion!)"
+      @mousedown.stop="onAddNode(hoveredSuggestion!, $event)"
     >
       <NodePreview
         :key="hoveredSuggestion?.name || ''"
@@ -148,15 +148,19 @@ const search = (query: string) => {
   debouncedTrackSearch(query)
 }
 
-const emit = defineEmits(['addFilter', 'removeFilter', 'addNode'])
+const emit = defineEmits<{
+  addFilter: [filter: FuseFilterWithValue<ComfyNodeDefImpl, string>]
+  removeFilter: [filter: FuseFilterWithValue<ComfyNodeDefImpl, string>]
+  addNode: [nodeDef: ComfyNodeDefImpl, dragEvent?: MouseEvent]
+}>()
 
 // Track node selection and emit addNode event
-const onAddNode = (nodeDef: ComfyNodeDefImpl) => {
+function onAddNode(nodeDef: ComfyNodeDefImpl, event?: MouseEvent) {
   telemetry?.trackNodeSearchResultSelected({
     node_type: nodeDef.name,
     last_query: currentQuery.value
   })
-  emit('addNode', nodeDef)
+  emit('addNode', nodeDef, event)
 }
 
 let inputElement: HTMLInputElement | null = null