[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>

tests-ui/platform/assets/composables/useAssetBrowserDialog.test.ts

@@ -6,11 +6,18 @@ import { useDialogStore } from '@/stores/dialogStore'
 // Mock the dialog store
 vi.mock('@/stores/dialogStore')
 
+// Mock the asset service
+vi.mock('@/platform/assets/services/assetService', () => ({
+  assetService: {
+    getAssetsForNodeType: vi.fn().mockResolvedValue([])
+  }
+}))
+
 // Test factory functions
 interface AssetBrowserProps {
   nodeType: string
   inputName: string
-  onAssetSelected?: ReturnType<typeof vi.fn>
+  onAssetSelected?: (filename: string) => void
 }
 
 function createAssetBrowserProps(
@@ -25,7 +32,7 @@ function createAssetBrowserProps(
 
 describe('useAssetBrowserDialog', () => {
   describe('Asset Selection Flow', () => {
-    it('auto-closes dialog when asset is selected', () => {
+    it('auto-closes dialog when asset is selected', async () => {
       // Create fresh mocks for this test
       const mockShowDialog = vi.fn()
       const mockCloseDialog = vi.fn()
@@ -41,7 +48,7 @@ describe('useAssetBrowserDialog', () => {
       const onAssetSelected = vi.fn()
       const props = createAssetBrowserProps({ onAssetSelected })
 
-      assetBrowserDialog.show(props)
+      await assetBrowserDialog.show(props)
 
       // Get the onSelect handler that was passed to the dialog
       const dialogCall = mockShowDialog.mock.calls[0][0]
@@ -50,14 +57,14 @@ describe('useAssetBrowserDialog', () => {
       // Simulate asset selection
       onSelectHandler('selected-asset-path')
 
-      // Should call the original callback and close dialog
+      // Should call the original callback and trigger hide animation
       expect(onAssetSelected).toHaveBeenCalledWith('selected-asset-path')
       expect(mockCloseDialog).toHaveBeenCalledWith({
         key: 'global-asset-browser'
       })
     })
 
-    it('closes dialog when close handler is called', () => {
+    it('closes dialog when close handler is called', async () => {
       // Create fresh mocks for this test
       const mockShowDialog = vi.fn()
       const mockCloseDialog = vi.fn()
@@ -72,7 +79,7 @@ describe('useAssetBrowserDialog', () => {
       const assetBrowserDialog = useAssetBrowserDialog()
       const props = createAssetBrowserProps()
 
-      assetBrowserDialog.show(props)
+      await assetBrowserDialog.show(props)
 
       // Get the onClose handler that was passed to the dialog
       const dialogCall = mockShowDialog.mock.calls[0][0]