support panoramic image in 3d node (#6638)

## Summary

Adds panoramic image support to the 3D node viewer, allowing users to
display equirectangular panoramic images as immersive backgrounds
alongside the existing tiled image mode.

## Changes

- Toggle between tiled and panorama rendering modes for background
images
- Field of view (FOV) control for panorama mode
- Refactored FOV slider into reusable PopupSlider component

## Screenshots


https://github.com/user-attachments/assets/8955d74b-b0e6-4b26-83ca-ccf902b43aa6

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6638-support-panoramic-image-in-3d-node-2a56d73d365081b98647f988130e312e)
by [Unito](https://www.unito.io)

tests-ui/tests/composables/useLoad3dViewer.test.ts

@@ -44,7 +44,8 @@ describe('useLoad3dViewer', () => {
         'Scene Config': {
           backgroundColor: '#282828',
           showGrid: true,
-          backgroundImage: ''
+          backgroundImage: '',
+          backgroundRenderMode: 'tiled'
         },
         'Camera Config': {
           cameraType: 'perspective',
@@ -115,6 +116,7 @@ describe('useLoad3dViewer', () => {
         materialMode: 'original'
       },
       setBackgroundImage: vi.fn().mockResolvedValue(undefined),
+      setBackgroundRenderMode: vi.fn(),
       forceRender: vi.fn()
     }