swarm ui: the status age helpers live in status-fields.ts

StatusMessage.tsx and statusMessage.ts differ only by case, which the esbuild step in the nix build can't read on a case-insensitive builder.

frontend/packages/swarm-ui/src/agent/detail/StatusMessage.tsx

@@ -3,7 +3,7 @@
 // agent with no message shows a dash and no age.
 import type { AgentStatusSnapshot } from "../AgentTypes.js";
 import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
-import { statusSetAtMs, statusText } from "./statusMessage.js";
+import { statusSetAtMs, statusText } from "./status-fields.js";
 
 export function StatusMessage({
   snapshot,

frontend/packages/swarm-ui/src/agent/detail/status-fields.ts

@@ -0,0 +1,20 @@
+// The agent's status message and when it set it, for the card and its detail.
+// Kept out of the component so `npm test` runs it.
+import type { AgentStatusSnapshot } from "../AgentTypes.js";
+
+/** When the message was set, in ms since the epoch, or null when the agent has
+ * set none or the time is not known. The wire carries seconds. */
+export function statusSetAtMs(
+  snapshot: AgentStatusSnapshot | null,
+): number | null {
+  const at = snapshot?.status_set_at;
+  return typeof at === "number" && Number.isFinite(at) && at > 0
+    ? at * 1000
+    : null;
+}
+
+/** The message, or a dash when there is none. */
+export function statusText(snapshot: AgentStatusSnapshot | null): string {
+  const text = snapshot?.status_text;
+  return text === null || text === undefined || text === "" ? "—" : text;
+}

frontend/packages/swarm-ui/test/status-message.test.mjs

@@ -6,7 +6,7 @@ import { test } from "node:test";
 import {
   statusSetAtMs,
   statusText,
-} from "../src/agent/detail/statusMessage.ts";
+} from "../src/agent/detail/status-fields.ts";
 
 const snap = (status_text, status_set_at) => ({
   status_text,