fix: create a local raycast for the HTML component

[alvarosabu]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a local Raycaster instance for the HTML component and streamlines demo pages by inlining TresCanvas props and updating GLTF usage.

• HTML.vue: remove global raycaster, add local Raycaster ref and clean up imports
• LaptopDemo.vue: switch to composable useGLTF (no await), remove gl config object, add a computed for the Macbook node
• HTMLDemo.vue: remove gl config object, inline TresCanvas props (clear-color, shadows)

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/core/misc/html/HTML.vue	Introduce local Raycaster, remove context-provided one
playground/vue/src/pages/misc/LaptopDemo.vue	Refactor GLTF loading, inline canvas props, compute model
playground/vue/src/pages/misc/HTMLDemo.vue	Inline canvas props, remove unused GL config object

Comments suppressed due to low confidence (1)

playground/vue/src/pages/misc/LaptopDemo.vue:8

• The computed helper is used here but not imported from 'vue'. Please add import { computed } from 'vue' at the top of the script.

const laptop = computed(() => nodes.value.Macbook)