/**
 * OMC HUD - Prompt Time Element
 *
 * Renders the timestamp of the last user prompt submission.
 * Recorded by the keyword-detector hook on UserPromptSubmit.
 */
/**
 * Render prompt submission time.
 *
 * Format: prompt:HH:MM:SS
 */
export declare function renderPromptTime(promptTime: Date | null): string | null;
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