feat: support open 3d viewer in media asset panel (#6703)

## Summary

Add support for previewing 3D assets directly in the Media Asset Panel.

## Changes

- **3D Asset Preview**: Clicking on 3D assets (`.glb`, `.gltf`, etc.) in
the Media Asset Panel now opens the full
  3D viewer

## Screenshots



https://github.com/user-attachments/assets/38808712-acc8-42aa-9f11-8d8bf2387b20

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6703-feat-support-open-3d-viewer-in-media-asset-panel-2ab6d73d3650811dbff9ecb570a0a878)
by [Unito](https://www.unito.io)

src/components/load3d/controls/viewer/ViewerSceneControls.vue

@@ -14,7 +14,7 @@
       </label>
     </div>
 
-    <div v-if="!hasBackgroundImage">
+    <div v-if="!hasBackgroundImage && !disableBackgroundUpload">
       <Button
         severity="secondary"
         :label="$t('load3d.uploadBackgroundImage')"
@@ -74,6 +74,7 @@ const backgroundRenderMode = defineModel<'tiled' | 'panorama'>(
 
 defineProps<{
   hasBackgroundImage?: boolean
+  disableBackgroundUpload?: boolean
 }>()
 
 const emit = defineEmits<{