[feat] integrate asset browser with widget system (#5629)

## Summary

Add asset browser dialog integration for combo widgets with full
animation support and proper state management.

(Thank you Claude from saving me me from merge conflict hell on this
one.)

## Changes

- Widget integration: combo widgets now use AssetBrowserModal for
eligible asset types
- Dialog animations: added animateHide() for smooth close transitions
- Async operations: proper sequencing of widget updates and dialog
animations
- Service layer: added getAssetsForNodeType() and getAssetDetails()
methods
- Type safety: comprehensive TypeScript types and error handling
- Test coverage: unit tests for all new functionality
- Bonus: fixed the hardcoded labels in AssetFilterBar

Widget behavior:
- Shows asset browser button for eligible widgets when asset API enabled
- Handles asset selection with proper callback sequencing
- Maintains widget value updates and litegraph notification

## Review Focus

I will call out some stuff inline.

## Screenshots


https://github.com/user-attachments/assets/9d3a72cf-d2b0-445f-8022-4c49daa04637

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5629-feat-integrate-asset-browser-with-widget-system-2726d73d365081a9a98be9a2307aee0b)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: GitHub Action <action@github.com>

src/platform/assets/composables/useAssetBrowserDialog.ts

@@ -1,5 +1,7 @@
 import AssetBrowserModal from '@/platform/assets/components/AssetBrowserModal.vue'
-import { useDialogStore } from '@/stores/dialogStore'
+import type { AssetItem } from '@/platform/assets/schemas/assetSchema'
+import { assetService } from '@/platform/assets/services/assetService'
+import { type DialogComponentProps, useDialogStore } from '@/stores/dialogStore'
 
 interface AssetBrowserDialogProps {
   /** ComfyUI node type for context (e.g., 'CheckpointLoaderSimple') */
@@ -8,36 +10,29 @@ interface AssetBrowserDialogProps {
   inputName: string
   /** Current selected asset value */
   currentValue?: string
-  /** Callback for when an asset is selected */
-  onAssetSelected?: (assetPath: string) => void
+  /**
+   * Callback for when an asset is selected
+   * @param {string} filename - The validated filename from user_metadata.filename
+   */
+  onAssetSelected?: (filename: string) => void
 }
 
 export const useAssetBrowserDialog = () => {
   const dialogStore = useDialogStore()
   const dialogKey = 'global-asset-browser'
 
-  function hide() {
-    dialogStore.closeDialog({ key: dialogKey })
-  }
-
-  function show(props: AssetBrowserDialogProps) {
-    const handleAssetSelected = (assetPath: string) => {
-      props.onAssetSelected?.(assetPath)
-      hide() // Auto-close on selection
+  async function show(props: AssetBrowserDialogProps) {
+    const handleAssetSelected = (filename: string) => {
+      props.onAssetSelected?.(filename)
+      dialogStore.closeDialog({ key: dialogKey })
     }
-
-    const handleClose = () => {
-      hide()
-    }
-
-    // Default dialog configuration for AssetBrowserModal
-    const dialogComponentProps = {
+    const dialogComponentProps: DialogComponentProps = {
       headless: true,
       modal: true,
-      closable: false,
+      closable: true,
       pt: {
         root: {
-          class: 'rounded-2xl overflow-hidden'
+          class: 'rounded-2xl overflow-hidden asset-browser-dialog'
         },
         header: {
           class: 'p-0 hidden'
@@ -48,6 +43,17 @@ export const useAssetBrowserDialog = () => {
       }
     }
 
+    const assets: AssetItem[] = await assetService
+      .getAssetsForNodeType(props.nodeType)
+      .catch((error) => {
+        console.error(
+          'Failed to fetch assets for node type:',
+          props.nodeType,
+          error
+        )
+        return []
+      })
+
     dialogStore.showDialog({
       key: dialogKey,
       component: AssetBrowserModal,
@@ -55,12 +61,13 @@ export const useAssetBrowserDialog = () => {
         nodeType: props.nodeType,
         inputName: props.inputName,
         currentValue: props.currentValue,
+        assets,
         onSelect: handleAssetSelected,
-        onClose: handleClose
+        onClose: () => dialogStore.closeDialog({ key: dialogKey })
       },
       dialogComponentProps
     })
   }
 
-  return { show, hide }
+  return { show }
 }