Rust 1.98's clippy adds `chunks_exact_to_as_chunks`, which `-D warnings`
turns into an error, so `cargo xtask ci` fails on main with the current
stable toolchain. The EPS stencil-mask loop and the cursor rasterizer
(and two cursor tests) now use `as_chunks`, which yields fixed-size
arrays; like `chunks_exact`, it skips an incomplete last chunk, so
nothing changes in behaviour.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>