Refactor: move useAuth from store/ into hooks/

store/ folder removed — single file doesn't justify its own folder.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/app/(app)/profile/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useAuth } from "@/store/useAuth";
+import { useAuth } from "@/hooks/useAuth";
 import { Avatar, AvatarFallback } from "@/components/ui/avatar";
 import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";