[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/tests/services/assetService.test.ts

@@ -4,6 +4,8 @@ import type { AssetItem } from '@/platform/assets/schemas/assetSchema'
 import { assetService } from '@/platform/assets/services/assetService'
 import { api } from '@/scripts/api'
 
+const mockGetCategoryForNodeType = vi.fn()
+
 vi.mock('@/stores/modelToNodeStore', () => ({
   useModelToNodeStore: vi.fn(() => ({
     getRegisteredNodeTypes: vi.fn(
@@ -14,7 +16,13 @@ vi.mock('@/stores/modelToNodeStore', () => ({
           'VAELoader',
           'TestNode'
         ])
-    )
+    ),
+    getCategoryForNodeType: mockGetCategoryForNodeType,
+    modelToNodeMap: {
+      checkpoints: [{ nodeDef: { name: 'CheckpointLoaderSimple' } }],
+      loras: [{ nodeDef: { name: 'LoraLoader' } }],
+      vae: [{ nodeDef: { name: 'VAELoader' } }]
+    }
   }))
 }))
 
@@ -210,4 +218,87 @@ describe('assetService', () => {
       ).toBe(false)
     })
   })
+
+  describe('getAssetsForNodeType', () => {
+    beforeEach(() => {
+      mockGetCategoryForNodeType.mockClear()
+    })
+
+    it('should return empty array for unregistered node types', async () => {
+      mockGetCategoryForNodeType.mockReturnValue(undefined)
+
+      const result = await assetService.getAssetsForNodeType('UnknownNode')
+
+      expect(mockGetCategoryForNodeType).toHaveBeenCalledWith('UnknownNode')
+      expect(result).toEqual([])
+    })
+
+    it('should use getCategoryForNodeType for efficient category lookup', async () => {
+      mockGetCategoryForNodeType.mockReturnValue('checkpoints')
+      const testAssets = [MOCK_ASSETS.checkpoints]
+      mockApiResponse(testAssets)
+
+      const result = await assetService.getAssetsForNodeType(
+        'CheckpointLoaderSimple'
+      )
+
+      expect(mockGetCategoryForNodeType).toHaveBeenCalledWith(
+        'CheckpointLoaderSimple'
+      )
+      expect(result).toEqual(testAssets)
+
+      // Verify API call includes correct category
+      expect(api.fetchApi).toHaveBeenCalledWith(
+        '/assets?include_tags=models,checkpoints'
+      )
+    })
+
+    it('should return empty array when no category found', async () => {
+      mockGetCategoryForNodeType.mockReturnValue(undefined)
+
+      const result = await assetService.getAssetsForNodeType('TestNode')
+
+      expect(result).toEqual([])
+      expect(api.fetchApi).not.toHaveBeenCalled()
+    })
+
+    it('should handle API errors gracefully', async () => {
+      mockGetCategoryForNodeType.mockReturnValue('loras')
+      mockApiError(500, 'Internal Server Error')
+
+      await expect(
+        assetService.getAssetsForNodeType('LoraLoader')
+      ).rejects.toThrow(
+        'Unable to load assets for LoraLoader: Server returned 500. Please try again.'
+      )
+    })
+
+    it('should return all assets without filtering for different categories', async () => {
+      // Test checkpoints
+      mockGetCategoryForNodeType.mockReturnValue('checkpoints')
+      const checkpointAssets = [MOCK_ASSETS.checkpoints]
+      mockApiResponse(checkpointAssets)
+
+      let result = await assetService.getAssetsForNodeType(
+        'CheckpointLoaderSimple'
+      )
+      expect(result).toEqual(checkpointAssets)
+
+      // Test loras
+      mockGetCategoryForNodeType.mockReturnValue('loras')
+      const loraAssets = [MOCK_ASSETS.loras]
+      mockApiResponse(loraAssets)
+
+      result = await assetService.getAssetsForNodeType('LoraLoader')
+      expect(result).toEqual(loraAssets)
+
+      // Test vae
+      mockGetCategoryForNodeType.mockReturnValue('vae')
+      const vaeAssets = [MOCK_ASSETS.vae]
+      mockApiResponse(vaeAssets)
+
+      result = await assetService.getAssetsForNodeType('VAELoader')
+      expect(result).toEqual(vaeAssets)
+    })
+  })
 })