fix(notifications): zh-CN for the display-time settings, and review leftovers (#564)

- zh-CN entries for the two new rows (label and description).
- The toast test header still described the dropped drawer logging, and the
  noise test typed three members nothing uses any more.
- clickNotification's closing brace had been re-indented by accident.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

test/notification-manager-noise.test.ts

@@ -24,9 +24,6 @@ type Manager = {
   normalizePreferences: (preferences: Record<string, unknown>) => NotificationPreferences;
   notify: (notification: Record<string, unknown>) => void;
   getToastDurationMs: () => number;
-  unreadCount: number;
-  markAllRead: () => void;
-  clearAll: () => void;
 };
 
 const openWindows: JSDOM[] = [];

test/toast-display-time.test.ts

@@ -1,7 +1,6 @@
 /**
- * @fileoverview showToast() display time and drawer logging: a toast with no explicit
- * `duration` uses the notification preference, an explicit `duration` (0 = sticky) still wins,
- * and every toast is recorded in the notification drawer.
+ * @fileoverview showToast() display time: a toast with no explicit `duration` uses the
+ * notification preference, and an explicit `duration` (0 = sticky) still wins.
  */
 import { readFileSync } from 'node:fs';
 import { resolve } from 'node:path';