fix: classify PLY assets as 3D media (#12319)

## Summary

Classify `.ply` as 3D media so PLY outputs are surfaced by queue/assets
preview flows.

## Changes

- **What**: adds `.ply` to shared 3D extension detection and falls back
to the asset `/view` URL when opening 3D assets without `preview_url`.
- **Breaking**: none.
- **Dependencies**: none.

## Review Focus

- This is the tactical FE fix for FE-129; it intentionally does not
solve the broader 3D media vs load3d-loadable split.
- Assets sidebar 3D viewer still prefers `preview_url`, but now has a
usable fallback for assets that only have the normal asset URL.

FE-129

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-12319-fix-classify-PLY-assets-as-3D-media-3646d73d365081218f0bde401b1601bd)
by [Unito](https://www.unito.io)

packages/shared-frontend-utils/src/formatUtil.test.ts

@@ -112,6 +112,7 @@ describe('formatUtil', () => {
         expect(getMediaTypeFromFilename('asset.gltf')).toBe('3D')
         expect(getMediaTypeFromFilename('binary.glb')).toBe('3D')
         expect(getMediaTypeFromFilename('apple.usdz')).toBe('3D')
+        expect(getMediaTypeFromFilename('scan.ply')).toBe('3D')
       })
     })
 

packages/shared-frontend-utils/src/formatUtil.ts

@@ -591,7 +591,7 @@ const IMAGE_EXTENSIONS = [
 ] as const
 const VIDEO_EXTENSIONS = ['mp4', 'm4v', 'webm', 'mov', 'avi', 'mkv'] as const
 const AUDIO_EXTENSIONS = ['mp3', 'wav', 'ogg', 'flac'] as const
-const THREE_D_EXTENSIONS = ['obj', 'fbx', 'gltf', 'glb', 'usdz'] as const
+const THREE_D_EXTENSIONS = ['obj', 'fbx', 'gltf', 'glb', 'usdz', 'ply'] as const
 const TEXT_EXTENSIONS = [
   'txt',
   'md',

src/components/sidebar/tabs/AssetsSidebarTab.vue

@@ -246,6 +246,7 @@ import type { OutputAssetMetadata } from '@/platform/assets/schemas/assetMetadat
 import { getOutputAssetMetadata } from '@/platform/assets/schemas/assetMetadataSchema'
 import type { AssetItem } from '@/platform/assets/schemas/assetSchema'
 import { getAssetDisplayName } from '@/platform/assets/utils/assetMetadataUtils'
+import { getAssetUrl } from '@/platform/assets/utils/assetUrlUtil'
 import type { MediaKind } from '@/platform/assets/schemas/mediaAssetSchema'
 import { resolveOutputAssetItems } from '@/platform/assets/utils/outputAssetUtil'
 import { isCloud } from '@/platform/distribution/types'
@@ -582,7 +583,7 @@ const handleZoomClick = (asset: AssetItem) => {
       title: getAssetDisplayName(asset),
       component: Load3dViewerContent,
       props: {
-        modelUrl: asset.preview_url || ''
+        modelUrl: asset.preview_url || getAssetUrl(asset)
       },
       dialogComponentProps: {
         style: 'width: 80vw; height: 80vh;',