3dgs & ply support (#7602)

## Summary

integrated sparkjs https://sparkjs.dev/, built by [world labs
](https://www.worldlabs.ai/) to support 3dgs.

- Add 3D Gaussian Splatting (3DGS) support using @sparkjsdev/spark
library
- Add PLY file format support with multiple rendering engines
- Support new file formats: `.ply`, `.spz`, `.splat`, `.ksplat`
- Add PLY Engine setting with three options: `threejs` (mesh), `fastply`
(optimized ASCII point clouds), `sparkjs` (3DGS)
- Add `FastPLYLoader` for 4-5x faster ASCII PLY parsing
- Add `original(Advanced)` material mode for point cloud rendering with
THREE.Points

3dgs generated by https://marble.worldlabs.ai/

test ply file from:
1. made by https://github.com/PozzettiAndrea/ComfyUI-DepthAnythingV3
2. threejs offically repo

## Screenshots


https://github.com/user-attachments/assets/44e64d3e-b58d-4341-9a70-a9aa64801220



https://github.com/user-attachments/assets/76b0dfba-0c12-4f64-91cb-bfc5d672294d



https://github.com/user-attachments/assets/2a8bfe81-1fb2-44c4-8787-dff325369c61



https://github.com/user-attachments/assets/e4beecee-d7a2-40c9-97f7-79b09c60312d

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7602-3dgs-ply-support-2cd6d73d3650814098fcea86cfaf747d)
by [Unito](https://www.unito.io)

pnpm-lock.yaml

@@ -78,6 +78,9 @@ catalogs:
     '@sentry/vue':
       specifier: ^8.48.0
       version: 8.48.0
+    '@sparkjsdev/spark':
+      specifier: ^0.1.10
+      version: 0.1.10
     '@storybook/addon-docs':
       specifier: ^10.1.9
       version: 10.1.9
@@ -374,6 +377,9 @@ importers:
       '@sentry/vue':
         specifier: 'catalog:'
         version: 8.48.0(pinia@2.2.2(typescript@5.9.3)(vue@3.5.13(typescript@5.9.3)))(vue@3.5.13(typescript@5.9.3))
+      '@sparkjsdev/spark':
+        specifier: 'catalog:'
+        version: 0.1.10
       '@tiptap/core':
         specifier: ^2.10.4
         version: 2.10.4(@tiptap/pm@2.10.4)
@@ -3112,6 +3118,9 @@ packages:
   '@sinclair/typebox@0.34.40':
     resolution: {integrity: sha512-gwBNIP8ZAYev/ORDWW0QvxdwPXwxBtLsdsJgSc7eDIRt8ubP+rxUBzPsrwnu16fgEF8Bx4lh/+mvQvJzcTM6Kw==}
 
+  '@sparkjsdev/spark@0.1.10':
+    resolution: {integrity: sha512-CiijdZQuj7KPDUqIZPiEqyUkJCYo1JqR05vq/V+ElxMwqR7L70ZuZDyIKcasjZHSiPB8pGRMH8HZGqUKO9aRPQ==}
+
   '@storybook/addon-docs@10.1.9':
     resolution: {integrity: sha512-SvwEZ32lyk5p3PRmE3pmfAhs4HMiVo5zxjTBVmK9kgz9zGgWCTlikb56tJ998hVe52CFyCvt3I9rkHeYMCKPww==}
     peerDependencies:
@@ -10857,6 +10866,10 @@ snapshots:
 
   '@sinclair/typebox@0.34.40': {}
 
+  '@sparkjsdev/spark@0.1.10':
+    dependencies:
+      fflate: 0.8.2
+
   '@storybook/addon-docs@10.1.9(@types/react@19.1.9)(esbuild@0.27.1)(rollup@4.53.5)(storybook@10.1.9(@testing-library/dom@10.4.1)(prettier@3.7.4)(react-dom@19.2.3(react@19.2.3))(react@19.2.3))(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(lightningcss@1.30.1)(terser@5.39.2)(tsx@4.19.4)(yaml@2.8.2))':
     dependencies:
       '@mdx-js/react': 3.1.1(@types/react@19.1.9)(react@19.2.3)