Implement Send for Context on WASM on `wasm32-unknown-unknown`

`hashbrown::raw::RawTable<(ViewportId, egui::context::ViewportState)>` cannot be sent between threads safely
within `egui::context::ContextImpl`, the trait `Send` is not implemented for `hashbrown::raw::RawTable<(ViewportId, egui::context::ViewportState)>`
required for `lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, egui::context::ContextImpl>` to implement `Sync`
required for `Arc<egui::mutex::RwLock<egui::context::ContextImpl>>` to implement `Send`
the full name for the type has been written to '/home/jeremyg/Code/Paiagram/target/wasm32-unknown-unknown/debug/build/paiagram/3dd480a25331672d/out/paiagram-3dd480a25331672d.long-type-15969912598606154758.txt'
consider using `--verbose` to print the full type name to the console

fn load_file(
    dialog: AsyncFileDialog,
    import_type: ImportType,
    state: Arc<Mutex<FileLoadState>>,
    ctx: Context,
) {
    *state.lock().unwrap() = FileLoadState::Reading { progress: None };
    let process = async move {
        let data = dialog.pick_file().await;
        let Some(data) = data else {
            *state.lock().unwrap() = FileLoadState::Idle;
            return;
        };
        *state.lock().unwrap() = FileLoadState::Processing { progress: None };
        let data = data.read().await;
        rayon::spawn(move || {
            let commands = generate_commands(&data, import_type).map_err(|e| e.to_string());
            *state.lock().unwrap() = FileLoadState::Done(commands);
            ctx.request_repaint();
        });
    };
    #[cfg(target_arch = "wasm32")]
    {
        wasm_bindgen_futures::spawn_local(process);
    }
    #[cfg(not(target_arch = "wasm32"))]
    {
        let _ = std::thread::spawn(move || pollster::block_on(process));
    }
}