/**
 * Server action that updates the default LLM model in settings.
 *
 * Persists the new model to the database via UpdateSettingsUseCase and
 * refreshes the in-memory settings singleton so subsequent reads reflect
 * the change within the current server process.
 *
 * @param model - The model identifier to set as the new default
 * @returns `{ ok: true }` on success, or `{ ok: false, error: string }` on failure.
 */
export declare function updateModel(model: string): Promise<{
    ok: boolean;
    error?: string;
}>;
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