Remove dead code and unused imports, drop useless assignments, and tune rules in eslint.config.js (underscore-prefixed unused names, intentional BOM/NBSP, React Compiler rules from eslint-plugin-react-hooks 7 as warnings).
Remove dead code and unused imports, drop useless assignments, and tune rules in eslint.config.js (underscore-prefixed unused names, intentional BOM/NBSP, React Compiler rules from eslint-plugin-react-hooks 7 as warnings).