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.
• Non-blocking asset loading. On desktop the mesh + HDR decode is cheap and runs synchronously; on wasm the WebAssetLoader preload is background-spawned by the wrapper, so build_ui returns before any asset is cached. A spawn_local polling loop waits for the preload, then populates a shared slot that the Stateful viewport wrapper swaps the loading overlay out for.

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