test: add beforeEach cleanup in push.test.ts to prevent flaky state leakage

Adds a beforeEach hook that clears subscriptions and resets mocks before
each test, making the suite robust against any state left by a previous
test even if afterEach didn't run cleanly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/tests/push.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, afterEach } from 'vitest';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 
 // ── Hoist mock functions so they're available inside vi.mock() factories ───────
 const { mockSetVapidDetails, mockWebPushSend } = vi.hoisted(() => ({
@@ -24,12 +24,16 @@ import { sendNotification, getVapidPublicKey } from '$lib/server/push.js';
 import { savePushSubscription, deletePushSubscription, getAllSubscriptions } from '$lib/server/db.js';
 import { rm } from 'fs/promises';
 
-afterEach(async () => {
-	mockSetVapidDetails.mockReset();
+beforeEach(() => {
+	// Ensure a clean subscription table before each test
+	for (const s of getAllSubscriptions()) deletePushSubscription(s.endpoint);
 	mockWebPushSend.mockReset();
+	mockSetVapidDetails.mockReset();
+});
+
+afterEach(async () => {
 	// Remove all test subscriptions between tests
-	const subs = getAllSubscriptions();
-	for (const s of subs) deletePushSubscription(s.endpoint);
+	for (const s of getAllSubscriptions()) deletePushSubscription(s.endpoint);
 	await rm(TEST_DATA_DIR, { recursive: true, force: true }).catch(() => {});
 });