chore(RECIPE-0004): complete iteration 1 — fix TypeScript Timer type errors

- Fixed NodeJS.Timer → NodeJS.Timeout in scheduler.ts line 13
- Fixed NodeJS.Timer[] → NodeJS.Timeout[] in fixtures.ts line 151
- Resolves TypeScript compile errors from iteration 0 review
- All 260 tests passing, build succeeds with no errors

src/tests/queue-processor.spec.ts

@@ -8,6 +8,14 @@
 import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
 import { queueManager } from '$lib/server/queue/QueueManager';
 
+// Mock web-push module BEFORE importing modules that depend on it
+vi.mock('web-push', () => ({
+  default: {
+    setVapidDetails: vi.fn(),
+    sendNotification: vi.fn().mockResolvedValue({} as any)
+  }
+}));
+
 // Mock queueConfig BEFORE importing QueueProcessor
 vi.mock('$lib/server/queue/config', () => ({
   queueConfig: {
@@ -19,8 +27,9 @@ vi.mock('$lib/server/queue/config', () => ({
       serverUrl: 'http://localhost:8080'
     },
     push: {
-      vapidPublicKey: 'test-public-key',
-      vapidPrivateKey: 'test-private-key'
+      vapidPublicKey: 'BNextdcB_fQ0BVvyGioM5L8Tf9vKQjs-WnF-rUbnU8MdWIZQYfggIHxBnW21I-lq_0HykLCdMpYj8d5joavWdxQ',
+      vapidPrivateKey: 'JwxI_KcsBcehYcTOufMcbVWJjCq1QbH5FJmSyQuG680',
+      vapidEmail: 'mailto:test@example.com'
     }
   }
 }));