feat: unify alerts into one plugin, channels, rules and inbox

plugins/alerts/src/frontend/format.ts

@@ -0,0 +1,30 @@
+import { ANNOUNCEMENT_SOURCE } from "../types";
+
+export function timeAgo(iso: string, language: string): string {
+  // SQLite's CURRENT_TIMESTAMP has no zone; it is UTC.
+  const normalized = /[zZ]|[+-]\d\d:?\d\d$/.test(iso)
+    ? iso
+    : `${iso.replace(" ", "T")}Z`;
+  const ms = Date.parse(normalized);
+  if (!Number.isFinite(ms)) return "";
+  const seconds = Math.round((ms - Date.now()) / 1000);
+  const format = new Intl.RelativeTimeFormat(language || "en", {
+    numeric: "auto",
+  });
+  const abs = Math.abs(seconds);
+  if (abs < 60) return format.format(seconds, "second");
+  if (abs < 3600) return format.format(Math.round(seconds / 60), "minute");
+  if (abs < 86400) return format.format(Math.round(seconds / 3600), "hour");
+  return format.format(Math.round(seconds / 86400), "day");
+}
+
+export function sourceLabel(
+  source: string,
+  t: (key: string, options?: Record<string, unknown>) => string,
+): string {
+  if (source === ANNOUNCEMENT_SOURCE) return t("inbox.sourceTermix");
+  return source
+    .split("-")
+    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+    .join(" ");
+}