B: Fix potential memory leaks

rsconcept/frontend/src/features/home/home-page.tsx

@@ -1,5 +1,7 @@
 'use client';
 
+import { useEffect } from 'react';
+
 import { urls, useConceptNavigation } from '@/app';
 import { useAuthSuspense } from '@/features/auth';
 
@@ -9,12 +11,14 @@ export function HomePage() {
   const router = useConceptNavigation();
   const { isAnonymous } = useAuthSuspense();
 
-  if (isAnonymous) {
+  useEffect(() => {
     // Note: Timeout is needed to let router initialize
-    setTimeout(() => router.replace({ path: urls.login }), PARAMETER.minimalTimeout);
-  } else {
-    setTimeout(() => router.replace({ path: urls.library }), PARAMETER.minimalTimeout);
-  }
+    const timeoutId = setTimeout(() => {
+      router.replace({ path: isAnonymous ? urls.login : urls.library });
+    }, PARAMETER.minimalTimeout);
+
+    return () => clearTimeout(timeoutId);
+  }, [router, isAnonymous]);
 
   return null;
 }

rsconcept/frontend/src/hooks/use-browser-navigation.ts

@@ -9,16 +9,28 @@ export function useBrowserNavigation() {
   const end = useAppTransitionStore(state => state.endNavigation);
 
   useEffect(() => {
+    let timeoutId: ReturnType<typeof setTimeout> | null = null;
+
     const onPopState = () => {
       start();
 
+      if (timeoutId) {
+        clearTimeout(timeoutId);
+      }
+
       // Fallback to end the navigation in case route completes with cache
-      setTimeout(() => {
+      timeoutId = setTimeout(() => {
         end();
-      }, DELAY_CACHE_CHECK); // or cancel after Suspense/loader finishes
+        timeoutId = null;
+      }, DELAY_CACHE_CHECK);
     };
 
     window.addEventListener('popstate', onPopState);
-    return () => window.removeEventListener('popstate', onPopState);
+    return () => {
+      window.removeEventListener('popstate', onPopState);
+      if (timeoutId) {
+        clearTimeout(timeoutId);
+      }
+    };
   }, [start, end]);
 }