3D Mesh Demo renders the Khronos glTF DamagedHelmet sample model

3D Mesh Demo — renders the Khronos glTF DamagedHelmet sample model

Demonstrates:

• blinc_canvas_kit::SceneKit3D — orbit camera + light rig wrapped around a canvas element, with drag/scroll input wired for free.
• DrawContext::draw_mesh_data — the direct-render mesh path. The canvas closure just calls ctx.draw_mesh_data(&mesh, transform); everything behind that (camera capture, pending-mesh queue, GpuPaintContext → GpuRenderer dispatch, PBR shading) is plumbing.
• Inline glTF loading — no external gltf crate dep. The sample model has a fixed layout (single mesh, single primitive, packed f32 attributes at known bufferView offsets, u16 indices), so parsing is a handful of offset reads plus a blinc_image::ImageData call for the albedo texture.

<iframe src="../../examples/mesh_3d_demo/index.html" width="100%" height="560" loading="lazy" style="border:1px solid #45475a;border-radius:8px;background:#181825;" title="Blinc mesh_3d_demo example" ></iframe>

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