feat: web UI chat render, panels, presence + analytics

frontend/src/lib/format/presence.ts

@@ -0,0 +1,21 @@
+import type { PresenceSample } from "$lib/api/types";
+import { formatListDate } from "$lib/format/datetime";
+
+export function formatPresence(sample: PresenceSample): string {
+  switch (sample.status) {
+    case "online":
+      return "online";
+    case "recently":
+      return "last seen recently";
+    case "last_week":
+      return "last seen within a week";
+    case "last_month":
+      return "last seen within a month";
+    case "long_time_ago":
+      return "last seen a long time ago";
+    default:
+      return sample.last_online_date
+        ? `last seen ${formatListDate(sample.last_online_date)}`
+        : "offline";
+  }
+}