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/plan.ts

@@ -151,7 +151,7 @@ export function planMarble(model: RenderModel, frame: PageFrame, v: MarbleVarian
   let k = 0;
   const clientW = textW(k++);
   const bankW = hasBank ? textW(k++) : 0;
-  const idsW = hasIds ? textW(k++) : 0;
+  const idsW = hasIds ? textW(k) : 0;
   const head = leading(r.heading) + v.parties.headingGap;
   let clientH = head + textHeight(r.body, c.name, clientW);
   for (const l of c.addressLines) clientH += textHeight(r.body, l, clientW);