Fix react-hooks/set-state-in-effect lint errors from eslint-config-next bump

The eslint-config-next 16.2.3 -> 16.2.9 bump changed which setState-in-effect
calls the rule flags: carousel.tsx and the use-mobile hooks now trigger it
(legitimate external-sync-on-mount patterns, suppressed like the existing
nier-map/nier-shell cases), while the old suppressions in nier-map.tsx and
nier-shell.tsx became unused since the rule no longer flags those.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: mellowagain

components/nier-map.tsx

@@ -86,7 +86,6 @@ export function NierLeafletMap({ locations }: { locations: MapLocation[] }) {
         });
 
         mapInstance.current = map;
-        // eslint-disable-next-line react-hooks/set-state-in-effect
         setReady(true);
 
         return () => {

components/nier-shell.tsx

@@ -82,7 +82,6 @@ export function NierShell({ children }: { children: React.ReactNode }) {
     // Clear navigating state when pathname actually changes
     useEffect(() => {
         if (prevPathname.current !== pathname) {
-            // eslint-disable-next-line react-hooks/set-state-in-effect
             setIsNavigating(false);
             prevPathname.current = pathname;
         }

components/ui/carousel.tsx

@@ -93,6 +93,7 @@ function Carousel({
 
     React.useEffect(() => {
         if (!api) return;
+        // eslint-disable-next-line react-hooks/set-state-in-effect
         onSelect(api);
         api.on("reInit", onSelect);
         api.on("select", onSelect);

components/ui/use-mobile.tsx

@@ -11,6 +11,7 @@ export function useIsMobile() {
             setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
         };
         mql.addEventListener("change", onChange);
+        // eslint-disable-next-line react-hooks/set-state-in-effect
         setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
         return () => mql.removeEventListener("change", onChange);
     }, []);

hooks/use-mobile.ts

@@ -11,6 +11,7 @@ export function useIsMobile() {
             setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
         };
         mql.addEventListener("change", onChange);
+        // eslint-disable-next-line react-hooks/set-state-in-effect
         setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
         return () => mql.removeEventListener("change", onChange);
     }, []);