Function copy_into 

pub fn copy_into<T: Copy>(
    dest: &mut StridedViewMut<'_, T>,
    src: &StridedView<'_, T>,
) -> Result<()>

Copy elements from source to destination: dest[i] = src[i].

Uses HPTT-inspired blocked permutation with bilateral dimension fusion, cache-aware blocking, and optimal loop ordering.

This is a simple copy without ElementOp support. For copies with element operations (conj, transpose, etc.), use strided_kernel::copy_into.