~anthropic/claude-sonnet-latest → A (6:4)

Side A is a self-contained, verifiable improvement: it consolidates multiple copy buttons into one panel, adds a real safety invariant (assert_cli_panel_cmd_js_single_quote_safe) preventing broken/unsafe inline JS, and consistently updates all call sites plus both theme CSS files. Side B deletes a working combinator-based engine.rs and its test suite but references new `graph`/`parse` modules that aren't shown being created in this diff, making the change impossible to verify for correctness or completeness, and the terse 'url stuff' message signals low care despite touching core canonicalization logic.