feat: Implement new authentication and account management system, refactoring password gates and settings components.

lib/utils/profile-storage.ts

@@ -0,0 +1,10 @@
+import { getProfileId } from '@/lib/store/auth-store';
+
+/**
+ * Returns a profiled localStorage key based on the current user's profileId.
+ * If no session exists, returns the base key unchanged (backward compatible).
+ */
+export function profiledKey(baseKey: string): string {
+  const id = getProfileId();
+  return id ? `${baseKey}-p-${id}` : baseKey;
+}