/**
 * Render the banner header for the TUI.
 *
 * @param version - App version string (e.g. "0.2.0")
 * @param appName - App name. Block art is only used for "Mastra Code" (default).
 * @returns Styled multi-line string ready for display.
 */
export declare function renderBanner(version: string, appName?: string): string;
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