Improve template search input performance issue (#8343)

## Summary

Improve Template search input performance issue #8134
This was caused by the search logic running too frequently (throttled at
50ms), causing the main thread to block on every few keystrokes.


## Changes
Use debouncing that wait until you stop typing for a specific time
(300ms) before running.
It makes the searching function more smoothly.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8343-Improve-template-search-input-performance-issue-2f56d73d36508144bdf9fa5e0cd76818)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/components/custom/widget/WorkflowTemplateSelectorDialog.vue

@@ -772,7 +772,7 @@ useIntersectionObserver(loadTrigger, () => {
 // Reset pagination when filters change
 watch(
   [
-    searchQuery,
+    filteredTemplates,
     selectedNavItem,
     sortBy,
     selectedModels,

src/composables/useTemplateFiltering.ts

@@ -1,4 +1,4 @@
-import { refThrottled, watchDebounced } from '@vueuse/core'
+import { refDebounced, watchDebounced } from '@vueuse/core'
 import Fuse from 'fuse.js'
 import type { IFuseOptions } from 'fuse.js'
 import { computed, ref, watch } from 'vue'
@@ -119,7 +119,7 @@ export function useTemplateFiltering(
     )
   })
 
-  const debouncedSearchQuery = refThrottled(searchQuery, 50)
+  const debouncedSearchQuery = refDebounced(searchQuery, 150)
 
   const filteredBySearch = computed(() => {
     if (!debouncedSearchQuery.value.trim()) {