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>

browser_tests/tests/nodeSearchBox.spec.ts

@@ -18,7 +18,10 @@ test.describe('Node search box', { tag: '@node' }, () => {
       'Comfy.LinkRelease.ActionShift',
       'search box'
     )
-    await comfyPage.settings.setSetting('Comfy.NodeSearchBoxImpl', 'default')
+    await comfyPage.settings.setSetting(
+      'Comfy.NodeSearchBoxImpl',
+      'v1 (legacy)'
+    )
   })
 
   test(`Can trigger on empty canvas double click`, async ({ comfyPage }) => {
@@ -45,7 +48,10 @@ test.describe('Node search box', { tag: '@node' }, () => {
     await comfyPage.setup({ clearStorage: true })
     // Simulate new user with 1.24.1+ installed version
     await comfyPage.settings.setSetting('Comfy.InstalledVersion', '1.24.1')
-    await comfyPage.settings.setSetting('Comfy.NodeSearchBoxImpl', 'default')
+    await comfyPage.settings.setSetting(
+      'Comfy.NodeSearchBoxImpl',
+      'v1 (legacy)'
+    )
     // Don't set LinkRelease settings explicitly to test versioned defaults
 
     await comfyPage.canvasOps.disconnectEdge()
@@ -285,7 +291,10 @@ test.describe('Release context menu', { tag: '@node' }, () => {
       'Comfy.LinkRelease.ActionShift',
       'search box'
     )
-    await comfyPage.settings.setSetting('Comfy.NodeSearchBoxImpl', 'default')
+    await comfyPage.settings.setSetting(
+      'Comfy.NodeSearchBoxImpl',
+      'v1 (legacy)'
+    )
   })
 
   test(
@@ -329,7 +338,10 @@ test.describe('Release context menu', { tag: '@node' }, () => {
     await comfyPage.setup({ clearStorage: true })
     // Simulate existing user with pre-1.24.1 version
     await comfyPage.settings.setSetting('Comfy.InstalledVersion', '1.23.0')
-    await comfyPage.settings.setSetting('Comfy.NodeSearchBoxImpl', 'default')
+    await comfyPage.settings.setSetting(
+      'Comfy.NodeSearchBoxImpl',
+      'v1 (legacy)'
+    )
     // Don't set LinkRelease settings explicitly to test versioned defaults
 
     await comfyPage.canvasOps.disconnectEdge()
@@ -350,7 +362,10 @@ test.describe('Release context menu', { tag: '@node' }, () => {
       'Comfy.LinkRelease.Action',
       'context menu'
     )
-    await comfyPage.settings.setSetting('Comfy.NodeSearchBoxImpl', 'default')
+    await comfyPage.settings.setSetting(
+      'Comfy.NodeSearchBoxImpl',
+      'v1 (legacy)'
+    )
 
     await comfyPage.canvasOps.disconnectEdge()
     // Context menu should appear due to explicit setting, not search box