openai/gpt-chat-latest → A (5:1)

Side A adds lasting tooling improvements by pinning the required `rustfmt` and `clippy` components in `rust-toolchain.toml`, configuring rust-analyzer to use the project toolchain, and cleaning up a duplicated CSS rule, while the vast majority of the remaining diff is mechanical formatting. Side B only removes an unused test-like function that was generating a warning, which is a minor cleanup with limited long-term impact.