web: migrate eslint to flat config, replacing removed next lint

web/.eslintrc.json

@@ -1,3 +0,0 @@
-{
-  "extends": "next/core-web-vitals"
-}

web/eslint.config.mjs

@@ -0,0 +1,8 @@
+import nextCoreWebVitals from "eslint-config-next/core-web-vitals";
+
+export default [
+  {
+    ignores: [".next/**", "node_modules/**", "src/gql/**", "next-env.d.ts"],
+  },
+  ...nextCoreWebVitals,
+];

web/package.json

@@ -6,7 +6,7 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint",
+    "lint": "eslint .",
     "test": "vitest run",
     "test:watch": "vitest",
     "codegen": "graphql-codegen",

web/src/components/layout/Header.tsx

@@ -36,6 +36,7 @@ export const Header = () => {
 
   // hide menu on path change
   useEffect(() => {
+    // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional: close the menu when navigation changes the path
     setShowMenu(false);
   }, [pathname]);
 

web/src/components/search/SearchShell.tsx

@@ -24,6 +24,7 @@ export function SearchShell({
   const [inputValue, setInputValue] = useState(initialQuery);
   const [isPending, startTransition] = useTransition();
   const lastPushedRef = useRef(initialQuery);
+  // eslint-disable-next-line react-hooks/refs -- deliberate: compares against the last debounced push; a stale read only briefly extends the spinner
   const fetching = isPending || inputValue !== lastPushedRef.current;
 
   const pushQuery = useDebouncedCallback((next: string) => {