~anthropic/claude-sonnet-latest → B (8:2)

Side B is a substantial, workspace-wide rustfmt pass plus real tooling fixes (pinning rustfmt/clippy components in rust-toolchain.toml, adding .vscode settings for rust-analyzer, and deduplicating a redundant CSS rule), improving consistency and dev workflow across the whole codebase. Side A is a tiny, narrowly-scoped 'nits' commit that removes some UI elements and swaps CSS gradient stop ordering, which is minor and even partially redundant with/overlaps B's cleanup of the same CSS block.