Helpers disposal issue

[alvarosabu]

Describe the bug

Whenever we unmount the TresCanvas on route change, for example, we are recursively disposing and deleting scene references. This seems to interfere with Helper's own disposal cycle.

chunk-TMRGR37B.js?v=d91265db:20290 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'dispose')
    at DirectionalLightHelper.dispose (chunk-TMRGR37B.js?v=d91265db:20290:30)
    at disposeObject3D (index.ts:302:14)
    at index.ts:294:29
    at Array.forEach (<anonymous>)
    at disposeObject3D (index.ts:294:12)
    at dispose (TresCanvas.vue:162:3)
    at unmountCanvas (TresCanvas.vue:183:3)

Reproduction

Internal

Steps to reproduce

1. Add a helper to the scene
2. Change route.

System Info

System:
    OS: macOS 15.2
    CPU: (8) arm64 Apple M1 Pro
    Memory: 192.69 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.11.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.4 - /usr/local/bin/npm
    pnpm: 9.15.4 - ~/Library/pnpm/pnpm
    bun: 1.0.2 - ~/.bun/bin/bun
  Browsers:
    Brave Browser: 120.1.61.116
    Chrome: 132.0.6834.160
    Safari: 18.2
  npmPackages:
    @tresjs/cientos: 4.0.3 => 4.0.3 
    @tresjs/core: workspace:^ => 4.3.2 
    @tresjs/leches: https://pkg.pr.new/@tresjs/leches@9ad0cd3 => 0.14.1

Used Package Manager

pnpm

Code of Conduct

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• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.