story-kit: merge 144_story_add_build_timestamp_and_persist_chat_history_across_rebuilds

frontend/src/components/ChatHeader.tsx

@@ -1,3 +1,13 @@
+function formatBuildTime(isoString: string): string {
+	const d = new Date(isoString);
+	const year = d.getUTCFullYear();
+	const month = String(d.getUTCMonth() + 1).padStart(2, "0");
+	const day = String(d.getUTCDate()).padStart(2, "0");
+	const hours = String(d.getUTCHours()).padStart(2, "0");
+	const minutes = String(d.getUTCMinutes()).padStart(2, "0");
+	return `Built: ${year}-${month}-${day} ${hours}:${minutes}`;
+}
+
 interface ContextUsage {
 	used: number;
 	total: number;
@@ -109,6 +119,18 @@ export function ChatHeader({
 			</div>
 
 			<div style={{ display: "flex", alignItems: "center", gap: "16px" }}>
+				<div
+					style={{
+						fontSize: "0.75em",
+						color: "#555",
+						whiteSpace: "nowrap",
+						fontFamily: "monospace",
+					}}
+					title={__BUILD_TIME__}
+				>
+					{formatBuildTime(__BUILD_TIME__)}
+				</div>
+
 				<div
 					style={{
 						fontSize: "0.9em",