Replace session with user in various files

This change mainly involves replacing 'session' with 'user' in various files in several applications. The function calls related to 'session' have been refactored to reflect 'user'. The '@supabase/supabase-js' package dependency has

apps/web/app/not-found.tsx

@@ -19,12 +19,12 @@ const NotFoundPage = async () => {
   const client = getSupabaseServerComponentClient();
 
   const {
-    data: { session },
-  } = await client.auth.getSession();
+    data: { user },
+  } = await client.auth.getUser();
 
   return (
     <div className={'flex h-screen flex-1 flex-col'}>
-      <SiteHeader session={session} />
+      <SiteHeader user={user} />
 
       <div
         className={