fix(frontend): cleaner fix for onboarding (#2415)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/app/search/page.tsx

@@ -1,6 +1,6 @@
 "use client";
 import { usePathname } from "next/navigation";
-import { useLayoutEffect, useState } from "react";
+import { useEffect, useState } from "react";
 
 import { QuivrLogo } from "@/lib/assets/QuivrLogo";
 import { AddBrainModal } from "@/lib/components/AddBrainModal";
@@ -20,7 +20,7 @@ import { ButtonType } from "@/lib/types/QuivrButton";
 import styles from "./page.module.scss";
 
 const Search = (): JSX.Element => {
-  const [isPageLoaded, setIsPageLoaded] = useState<boolean>(false);
+  const [isUserDataFetched, setIsUserDataFetched] = useState(false);
   const pathname = usePathname();
   const { session } = useSupabase();
   const { isBrainCreationModalOpened, setIsBrainCreationModalOpened } =
@@ -28,11 +28,15 @@ const Search = (): JSX.Element => {
   const { userIdentityData } = useUserData();
   const { isDarkMode } = useUserSettingsContext();
 
-  useLayoutEffect(() => {
+  useEffect(() => {
+    if (userIdentityData) {
+      setIsUserDataFetched(true);
+    }
+  }, [userIdentityData]);
+
+  useEffect(() => {
     if (session === null) {
       redirectToLogin();
-    } else {
-      setTimeout(() => setIsPageLoaded(true), 1000);
     }
   }, [pathname, session]);
 
@@ -80,7 +84,7 @@ const Search = (): JSX.Element => {
       </div>
       {!isBrainCreationModalOpened &&
         !userIdentityData?.onboarded &&
-        !!isPageLoaded && (
+        !!isUserDataFetched && (
           <div className={styles.onboarding_overlay}>
             <div className={styles.first_brain_button}>
               <MessageInfoBox type="tutorial">