/**
 * Browser URL security validation.
 */
/**
 * Validate a URL for browser navigation.
 * Blocks dangerous protocols (file://, javascript://, data://) and
 * private/internal IP addresses to prevent SSRF.
 * In Phase 3, URL whitelist from project settings will be enforced here.
 */
export declare function validateUrl(url: string): {
    valid: boolean;
    reason?: string;
};
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