minor fix

src/app/components/charts/FourPercentRuleChart.tsx

@@ -92,7 +92,7 @@ export function FourPercentRuleChart() {
               content={
                 <ChartTooltipContent
                   labelFormatter={(value) => `Year ${String(value)}`}
-                  indicator="dot"
+                  indicator="line"
                 />
               }
             />

vitest.setup.ts

@@ -3,6 +3,7 @@ import { vi } from 'vitest';
 
 // Provide a basic matchMedia mock for jsdom so components using media queries
 // (e.g. pointer detection in Tooltip) do not throw during tests.
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 if (!window.matchMedia) {
   Object.defineProperty(window, 'matchMedia', {
     writable: true,