The v0.7.0 web (GitHub Pages) release failed to compile under
--no-default-features. Two symbols leaked into the wasm build:
* `solid_section` (SECTION command) used truck-meshalgo directly
(`triangulation`/`extract_interference`), but that crate is gated
behind the `solid3d` feature which is off on wasm. Gate the function
with `#[cfg(feature = "solid3d")]` and add a stub for builds without
it, mirroring `solid_model::boolean`.
* `register_as_handler` was `#[cfg(not(wasm32))]` while its caller
`set_default_app_blocking` was not, so wasm couldn't resolve it. Drop
the wasm gate; the existing non-win/lin/mac arm already returns `Ok`
on wasm, matching `unregister_handler`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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