Generalize keepMutedChatsArchived check

ts/util/canConversationBeUnarchived.ts

@@ -0,0 +1,23 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ConversationAttributesType } from '../model-types.d';
+import { isConversationMuted } from './isConversationMuted';
+
+export function canConversationBeUnarchived(
+  attrs: ConversationAttributesType
+): boolean {
+  if (!attrs.isArchived) {
+    return false;
+  }
+
+  if (!isConversationMuted(attrs)) {
+    return true;
+  }
+
+  if (window.storage.get('keepMutedChatsArchived') ?? false) {
+    return false;
+  }
+
+  return true;
+}