refactor(assets): remove isAssetPreviewSupported wrapper and simplify callers

Follow-up to the previous FE-729 commit. After deleting
isAssetAPIEnabled, isAssetPreviewSupported() became a wrapper that
always returned true. Remove the function and simplify all callers.

Changes:
- Delete isAssetPreviewSupported() from assetPreviewUtil.ts.
- Media3DTop.vue: drop the isAssetPreviewSupported() arm of the
  loadThumbnail guard (asset.name check is still required).
- saveMesh.ts: unwrap two `if (isAssetPreviewSupported()) { ... }`
  blocks in applySaveGLBOutput and the SaveGLB beforeRegisterNodeDef
  extension callback.
- FormDropdownMenuItem.vue: drop the early return from
  resolveMeshPreview.
- useLoad3d.ts: drop the isAssetPreviewSupported() arm of the
  modelReady guard.
- Tests: remove the dead "asset preview is unsupported" branches
  (useLoad3d, Media3DTop, FormDropdownMenuItem) and clean up the
  associated mocks and hoisted state.

Auto-fixed unrelated tailwind class-order lint errors in five files
(VirtualGrid, RightSidePanel, Textarea, ModelInfoPanel,
WidgetSelectDefault) to keep CI green.

src/components/common/VirtualGrid.vue

@@ -1,7 +1,7 @@
 <template>
   <div
     ref="container"
-    class="h-full scrollbar-thin scrollbar-thumb-(--dialog-surface) scrollbar-track-transparent scrollbar-gutter-stable overflow-y-auto [overflow-anchor:none]"
+    class="scrollbar-thin scrollbar-thumb-(--dialog-surface) scrollbar-track-transparent scrollbar-gutter-stable h-full overflow-y-auto [overflow-anchor:none]"
   >
     <div :style="topSpacerStyle" />
     <div :style="mergedGridStyle">

src/components/rightSidePanel/RightSidePanel.vue

@@ -370,7 +370,7 @@ function handleTitleCancel() {
     </section>
 
     <!-- Panel Content -->
-    <div class="flex-1 scrollbar-thin overflow-y-auto">
+    <div class="scrollbar-thin flex-1 overflow-y-auto">
       <TabErrors v-if="activeTab === 'errors'" />
       <template v-else-if="!hasSelection">
         <TabGlobalParameters v-if="activeTab === 'parameters'" />

src/components/ui/textarea/Textarea.vue

@@ -23,7 +23,7 @@ defineExpose({
     v-model="modelValue"
     :class="
       cn(
-        'flex min-h-16 w-full scrollbar-gutter-stable rounded-lg border-none bg-secondary-background px-3 py-2 text-sm text-base-foreground placeholder:text-muted-foreground focus-visible:ring-1 focus-visible:ring-border-default focus-visible:outline-none disabled:pointer-events-none disabled:opacity-50',
+        'scrollbar-gutter-stable flex min-h-16 w-full rounded-lg border-none bg-secondary-background px-3 py-2 text-sm text-base-foreground placeholder:text-muted-foreground focus-visible:ring-1 focus-visible:ring-border-default focus-visible:outline-none disabled:pointer-events-none disabled:opacity-50',
         className
       )
     "

src/composables/useLoad3d.test.ts

@@ -75,7 +75,6 @@ vi.mock('@/renderer/core/canvas/canvasStore', () => ({
 }))
 
 vi.mock('@/platform/assets/utils/assetPreviewUtil', () => ({
-  isAssetPreviewSupported: vi.fn(() => false),
   persistThumbnail: vi.fn().mockResolvedValue(undefined)
 }))
 
@@ -1483,22 +1482,9 @@ describe('useLoad3d', () => {
       expect(composable).toBeDefined()
     })
 
-    it('does not call captureThumbnail when asset preview is unsupported', async () => {
-      const { isAssetPreviewSupported } =
+    it('captures thumbnail and persists it when a model_file widget has a value', async () => {
+      const { persistThumbnail } =
         await import('@/platform/assets/utils/assetPreviewUtil')
-      vi.mocked(isAssetPreviewSupported).mockReturnValue(false)
-
-      const { handler } = await getModelReadyHandler()
-      handler()
-      await Promise.resolve()
-
-      expect(mockLoad3d.captureThumbnail).not.toHaveBeenCalled()
-    })
-
-    it('captures thumbnail and persists it when asset preview is supported and a model_file widget has a value', async () => {
-      const { isAssetPreviewSupported, persistThumbnail } =
-        await import('@/platform/assets/utils/assetPreviewUtil')
-      vi.mocked(isAssetPreviewSupported).mockReturnValue(true)
       vi.mocked(Load3dUtils.splitFilePath).mockReturnValue([
         '',
         'cube.glb'
@@ -1523,9 +1509,8 @@ describe('useLoad3d', () => {
     })
 
     it('skips persistence when the model widget has no value', async () => {
-      const { isAssetPreviewSupported, persistThumbnail } =
+      const { persistThumbnail } =
         await import('@/platform/assets/utils/assetPreviewUtil')
-      vi.mocked(isAssetPreviewSupported).mockReturnValue(true)
       mockNode.widgets = [
         { name: 'model_file', value: '' } as unknown as IWidget
       ]
@@ -1539,9 +1524,8 @@ describe('useLoad3d', () => {
     })
 
     it('swallows captureThumbnail rejections silently', async () => {
-      const { isAssetPreviewSupported, persistThumbnail } =
+      const { persistThumbnail } =
         await import('@/platform/assets/utils/assetPreviewUtil')
-      vi.mocked(isAssetPreviewSupported).mockReturnValue(true)
       vi.mocked(Load3dUtils.splitFilePath).mockReturnValue([
         '',
         'broken.glb'

src/composables/useLoad3d.ts

@@ -8,10 +8,7 @@ import { useChainCallback } from '@/composables/functional/useChainCallback'
 import type Load3d from '@/extensions/core/load3d/Load3d'
 import Load3dUtils from '@/extensions/core/load3d/Load3dUtils'
 import { createLoad3d } from '@/extensions/core/load3d/createLoad3d'
-import {
-  isAssetPreviewSupported,
-  persistThumbnail
-} from '@/platform/assets/utils/assetPreviewUtil'
+import { persistThumbnail } from '@/platform/assets/utils/assetPreviewUtil'
 import type {
   AnimationItem,
   CameraConfig,
@@ -862,7 +859,7 @@ export const useLoad3d = (nodeOrRef: MaybeRef<LGraphNode | null>) => {
       isFirstModelLoad = false
     },
     modelReady: () => {
-      if (!load3d || !isAssetPreviewSupported()) return
+      if (!load3d) return
 
       const node = nodeRef.value
       const modelWidget = node?.widgets?.find(

src/extensions/core/saveMesh.test.ts

@@ -50,7 +50,6 @@ vi.mock('@/scripts/domWidget', () => ({
 }))
 
 vi.mock('@/platform/assets/utils/assetPreviewUtil', () => ({
-  isAssetPreviewSupported: vi.fn(() => false),
   persistThumbnail: vi.fn()
 }))
 

src/extensions/core/saveMesh.ts

@@ -17,10 +17,7 @@ type SaveMeshOutput = NodeOutputWith<{
   '3d'?: ResultItem[]
 }>
 import type { CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
-import {
-  isAssetPreviewSupported,
-  persistThumbnail
-} from '@/platform/assets/utils/assetPreviewUtil'
+import { persistThumbnail } from '@/platform/assets/utils/assetPreviewUtil'
 import { app } from '@/scripts/app'
 import { ComponentWidgetImpl, addWidget } from '@/scripts/domWidget'
 import { useExtensionService } from '@/services/extensionService'
@@ -60,15 +57,13 @@ function applySaveGLBOutput(node: LGraphNode, fileInfo: ResultItem): void {
       silentOnNotFound: true
     })
 
-    if (isAssetPreviewSupported()) {
-      const filename = fileInfo.filename ?? ''
-      void load3d
-        .whenLoadIdle()
-        .then(() => load3d.captureThumbnail(256, 256))
-        .then((dataUrl) => fetch(dataUrl).then((r) => r.blob()))
-        .then((blob) => persistThumbnail(filename, blob))
-        .catch(() => {})
-    }
+    const filename = fileInfo.filename ?? ''
+    void load3d
+      .whenLoadIdle()
+      .then(() => load3d.captureThumbnail(256, 256))
+      .then((dataUrl) => fetch(dataUrl).then((r) => r.blob()))
+      .then((blob) => persistThumbnail(filename, blob))
+      .catch(() => {})
   })
 }
 
@@ -194,16 +189,14 @@ useExtensionService().registerExtension({
             silentOnNotFound: true
           })
 
-          if (isAssetPreviewSupported()) {
-            const filename = fileInfo.filename ?? ''
+          const filename = fileInfo.filename ?? ''
 
-            void load3d
-              .whenLoadIdle()
-              .then(() => load3d.captureThumbnail(256, 256))
-              .then((dataUrl) => fetch(dataUrl).then((r) => r.blob()))
-              .then((blob) => persistThumbnail(filename, blob))
-              .catch(() => {})
-          }
+          void load3d
+            .whenLoadIdle()
+            .then(() => load3d.captureThumbnail(256, 256))
+            .then((dataUrl) => fetch(dataUrl).then((r) => r.blob()))
+            .then((blob) => persistThumbnail(filename, blob))
+            .catch(() => {})
         }
       })
     }

src/platform/assets/components/Media3DTop.test.ts

@@ -5,15 +5,12 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 import type { AssetMeta } from '../schemas/mediaAssetSchema'
 import Media3DTop from './Media3DTop.vue'
 
-const {
-  mockUseIntersectionObserver,
-  mockFindServerPreviewUrl,
-  mockIsAssetPreviewSupported
-} = vi.hoisted(() => ({
-  mockUseIntersectionObserver: vi.fn(),
-  mockFindServerPreviewUrl: vi.fn(),
-  mockIsAssetPreviewSupported: vi.fn(() => true)
-}))
+const { mockUseIntersectionObserver, mockFindServerPreviewUrl } = vi.hoisted(
+  () => ({
+    mockUseIntersectionObserver: vi.fn(),
+    mockFindServerPreviewUrl: vi.fn()
+  })
+)
 
 vi.mock('@vueuse/core', async (importOriginal) => {
   const actual = await importOriginal<typeof VueUseCore>()
@@ -24,8 +21,7 @@ vi.mock('@vueuse/core', async (importOriginal) => {
 })
 
 vi.mock('../utils/assetPreviewUtil', () => ({
-  findServerPreviewUrl: mockFindServerPreviewUrl,
-  isAssetPreviewSupported: mockIsAssetPreviewSupported
+  findServerPreviewUrl: mockFindServerPreviewUrl
 }))
 
 function makeAsset(overrides: Partial<AssetMeta> = {}): AssetMeta {
@@ -66,7 +62,6 @@ const globalConfig = { mocks: { $t: (key: string) => key } }
 describe('Media3DTop', () => {
   beforeEach(() => {
     vi.clearAllMocks()
-    mockIsAssetPreviewSupported.mockReturnValue(true)
   })
 
   it('renders the placeholder when no thumbnail has loaded', () => {
@@ -117,18 +112,6 @@ describe('Media3DTop', () => {
     expect(img).toHaveAttribute('src', 'http://server/from-name.png')
   })
 
-  it('skips the server query when isAssetPreviewSupported is false', async () => {
-    fireObserverIntersecting()
-    mockIsAssetPreviewSupported.mockReturnValue(false)
-    render(Media3DTop, {
-      props: { asset: makeAsset() },
-      global: globalConfig
-    })
-    await flush()
-
-    expect(mockFindServerPreviewUrl).not.toHaveBeenCalled()
-  })
-
   it('picks up a patched preview_url after the IntersectionObserver gate has closed', async () => {
     // Initial render: observer fires, server has no preview yet — hasAttempted=true
     fireObserverIntersecting()

src/platform/assets/components/Media3DTop.vue

@@ -23,10 +23,7 @@ import { useIntersectionObserver } from '@vueuse/core'
 import { onBeforeUnmount, ref, watch } from 'vue'
 
 import type { AssetMeta } from '../schemas/mediaAssetSchema'
-import {
-  findServerPreviewUrl,
-  isAssetPreviewSupported
-} from '../utils/assetPreviewUtil'
+import { findServerPreviewUrl } from '../utils/assetPreviewUtil'
 
 const { asset } = defineProps<{ asset: AssetMeta }>()
 
@@ -49,7 +46,7 @@ async function loadThumbnail() {
 
   if (!asset?.src) return
 
-  if (asset.name && isAssetPreviewSupported()) {
+  if (asset.name) {
     const serverPreviewUrl = await findServerPreviewUrl(asset.name)
     if (serverPreviewUrl) {
       thumbnailSrc.value = serverPreviewUrl

src/platform/assets/components/modelInfo/ModelInfoPanel.vue

@@ -196,7 +196,7 @@
           rows="3"
           :class="
             cn(
-              'w-full resize-y scrollbar-gutter-stable rounded-lg border border-transparent bg-transparent px-3 py-2 text-sm text-component-node-foreground transition-colors outline-none focus:bg-component-node-widget-background',
+              'scrollbar-gutter-stable w-full resize-y rounded-lg border border-transparent bg-transparent px-3 py-2 text-sm text-component-node-foreground transition-colors outline-none focus:bg-component-node-widget-background',
               isImmutable && 'cursor-not-allowed'
             )
           "

src/platform/assets/utils/assetPreviewUtil.test.ts

@@ -3,7 +3,6 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 import {
   findOutputAsset,
   findServerPreviewUrl,
-  isAssetPreviewSupported,
   persistThumbnail
 } from '@/platform/assets/utils/assetPreviewUtil'
 
@@ -77,12 +76,6 @@ const localAssetWithPreview = {
   preview_url: '/api/view?type=output&filename=preview.png'
 }
 
-describe('isAssetPreviewSupported', () => {
-  it('returns true (asset API is always available)', () => {
-    expect(isAssetPreviewSupported()).toBe(true)
-  })
-})
-
 describe('findOutputAsset', () => {
   beforeEach(() => vi.clearAllMocks())
 

src/platform/assets/utils/assetPreviewUtil.ts

@@ -10,15 +10,6 @@ interface AssetRecord {
   preview_id?: string | null
 }
 
-/**
- * Asset preview support. Asset API is always available post-BE-786, so this
- * unconditionally returns `true`. Kept as a function to preserve the existing
- * caller surface; callers can be simplified in a follow-up.
- */
-export function isAssetPreviewSupported(): boolean {
-  return true
-}
-
 async function fetchAssets(
   params: Record<string, string>
 ): Promise<AssetRecord[]> {

src/renderer/extensions/vueNodes/widgets/components/WidgetSelectDefault.vue

@@ -98,7 +98,7 @@
           <div
             data-testid="widget-select-default-viewport"
             role="presentation"
-            class="flex max-h-56 min-w-full scrollbar-thin scrollbar-thumb-alpha-smoke-500-50 scrollbar-track-transparent scrollbar-gutter-stable flex-col gap-1 overflow-y-auto p-1 text-xs"
+            class="scrollbar-thin scrollbar-thumb-alpha-smoke-500-50 scrollbar-track-transparent scrollbar-gutter-stable flex max-h-56 min-w-full flex-col gap-1 overflow-y-auto p-1 text-xs"
             :style="viewportStyle"
             @pointerdown.capture.self="handleViewportPointerDown"
           >

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdownMenuItem.test.ts

@@ -12,14 +12,12 @@ import { AssetKindKey } from './types'
 import type { FormDropdownMenuItemProps } from './types'
 
 const mockFindServerPreviewUrl = vi.hoisted(() => vi.fn())
-const mockIsAssetPreviewSupported = vi.hoisted(() => vi.fn(() => true))
 const intersectionCallbacks = vi.hoisted(
   () => [] as Array<(entries: Array<{ isIntersecting: boolean }>) => void>
 )
 
 vi.mock('@/platform/assets/utils/assetPreviewUtil', () => ({
-  findServerPreviewUrl: (name: string) => mockFindServerPreviewUrl(name),
-  isAssetPreviewSupported: () => mockIsAssetPreviewSupported()
+  findServerPreviewUrl: (name: string) => mockFindServerPreviewUrl(name)
 }))
 
 vi.mock('@vueuse/core', () => ({
@@ -83,7 +81,6 @@ describe('FormDropdownMenuItem', () => {
   beforeEach(() => {
     intersectionCallbacks.length = 0
     mockFindServerPreviewUrl.mockReset()
-    mockIsAssetPreviewSupported.mockReset().mockReturnValue(true)
   })
 
   describe('Label and name', () => {
@@ -167,14 +164,6 @@ describe('FormDropdownMenuItem', () => {
       expect(img.getAttribute('src')).toBe('/api/preview/resolved.png')
     })
 
-    it('skips lookup when asset preview is unsupported', async () => {
-      mockIsAssetPreviewSupported.mockReturnValue(false)
-      renderItem({ name: '3d/model.glb' }, { assetKind: 'mesh' })
-      fireIntersection(true)
-      await flushPromises()
-      expect(mockFindServerPreviewUrl).not.toHaveBeenCalled()
-    })
-
     it('only looks up once for repeated intersection events', async () => {
       mockFindServerPreviewUrl.mockResolvedValue(null)
       renderItem({ name: '3d/model.glb' }, { assetKind: 'mesh' })

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdownMenuItem.vue

@@ -5,10 +5,7 @@ import { useI18n } from 'vue-i18n'
 
 import { cn } from '@comfyorg/tailwind-utils'
 
-import {
-  findServerPreviewUrl,
-  isAssetPreviewSupported
-} from '@/platform/assets/utils/assetPreviewUtil'
+import { findServerPreviewUrl } from '@/platform/assets/utils/assetPreviewUtil'
 
 import { AssetKindKey } from './types'
 import type { FormDropdownMenuItemProps } from './types'
@@ -40,7 +37,6 @@ function toLookupName(name: string): string {
 }
 
 async function resolveMeshPreview() {
-  if (!isAssetPreviewSupported()) return
   const url = await findServerPreviewUrl(toLookupName(props.name))
   if (url) resolvedMeshPreview.value = url
 }