feat: model thumbnail previews in asset manager

[ThomasParenteau]

Objective:
Display thumbnail previews of 3D models in the asset manager front-end to improve asset browsing and selection.

Acceptance Criteria:

• 1. 3D model assets display rendered thumbnails
• 2. Thumbnails are generated automatically on import
• 3. Thumbnails are cached for performance
• 4. Fallback icons for unsupported formats
• 5. Thumbnail size is configurable
• 6. Replace material preview by sphere

Technical Details:

• Environment: Editor UI, Asset manager, Rendering system
• Components: Thumbnail generator, Asset manager UI, Rendering pipeline
• Resources: Thumbnail cache, Model loading, UI grid components

Dependencies: Asset import system

Context:
Thumbnail cash

look in the materials
check the scale of the model

[Sauterelle57]

We need a getVertices function to get all vertices of a model. That way we can calculate the distance of the camera to the model and get a preview of the entire model.

glm::vec3 ComputeCameraPosition(const ecs::Entity entity, const float verticalFovDeg, const float aspectRatio,
                                const glm::vec3 &camForward = glm::vec3(0, 0, -1))
{
    const auto &modelComponent = Application::m_coordinator->getComponent<components::ModelComponent>(entity);
    if (modelComponent.model == nullptr) {
        LOG(NEXO_ERROR, "Model component is null for entity {}", entity);
        return {0.0f, 0.0f, 0.0f}; // Default position if model is not available
    }
    const auto vertices = modelComponent.model.getVertices();  // TODO: Create a method to get vertices from the model
    [...]
}