Refresh profiles on app start (at most every 12 hours)

ts/util/isNormalNumber.ts

@@ -0,0 +1,8 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function isNormalNumber(value: unknown): value is number {
+  return (
+    typeof value === 'number' && !Number.isNaN(value) && Number.isFinite(value)
+  );
+}