fix: eslint findings

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).

src/pdf/templates/marble/Layout.tsx

@@ -202,7 +202,7 @@ function Parties({ ctx }: { ctx: Ctx }) {
   const blocks: ReactNode[] = [<ClientBlock key="a" ctx={ctx} width={text[0]} />];
   let k = 1;
   if (plan.info.hasBank) blocks.push(<PayableBlock key="b" ctx={ctx} width={text[k++]} />);
-  if (plan.info.hasIds) blocks.push(<IdsBlock key="c" ctx={ctx} width={text[k++]} />);
+  if (plan.info.hasIds) blocks.push(<IdsBlock key="c" ctx={ctx} width={text[k]} />);
   const specs: ColSpec[] = cols.map((w, i) => (i === cols.length - 1 ? { fill: true } : { fixed: w }));
   return (
     <View style={{ ...pinned(plan.W), paddingLeft: v.inset.left } as never}>