/**
 * Encrypts and stores a profile object in localStorage.
 * Uses AES-GCM with a browser-bound derived key so the ciphertext
 * is not portable to other origins or browsers.
 */
export declare function saveProfile(profile: Record<string, any>): Promise<void>;
/**
 * Decrypts and returns the stored profile, or null if absent/tampered.
 */
export declare function loadProfile(): Promise<Record<string, any> | null>;
/**
 * Removes the stored profile.
 */
export declare function clearProfile(): void;