feat(e2e): seed admin notifications + resume strip for dashboard proofshots

- captureProofshots() now accepts an optional setup(page) callback that
  runs before each screenshot's page.goto(), so localStorage can be
  injected reliably without loading a backend-dependent page
- dashboard-screenshots.spec.ts seeds 2 notifications (MENTION + REPLY)
  for admin via direct DB insert in beforeAll, cleans up in afterAll
- localStorage.familienarchiv.lastVisited injected directly via
  page.evaluate() — no fragile document page navigation needed
- Updated screenshots committed (all 6 now show all 4 widgets)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/e2e/proofshots.ts

@@ -1,14 +1,23 @@
 /**
  * Shared proofshot helper for Playwright.
  *
- * Usage in any spec file:
+ * Basic usage:
  *   import { captureProofshots } from './proofshots';
  *   captureProofshots('/persons', 'persons');
  *
- * This registers one test per viewport × theme combination.
+ * With per-test setup (e.g. seed localStorage before navigation):
+ *   captureProofshots('/persons', 'persons', {
+ *     setup: async (page) => {
+ *       await page.goto('/persons/some-id'); // populates any localStorage state
+ *     }
+ *   });
+ *
+ * The setup callback runs before each screenshot's page.goto(url), so any
+ * localStorage values it writes persist into the main navigation.
+ *
  * Screenshots are saved to proofshot-artifacts/{featureName}/.
  */
-import { test } from '@playwright/test';
+import { type Page, test } from '@playwright/test';
 import path from 'path';
 import fs from 'fs';
 import { fileURLToPath } from 'url';
@@ -21,20 +30,38 @@ const viewports = [
 	{ name: 'desktop', width: 1440, height: 900 }
 ];
 
+interface ProofshotOptions {
+	/**
+	 * Optional async callback that runs before each screenshot's page.goto(url).
+	 * Use it to seed localStorage, visit a prerequisite page, etc.
+	 */
+	setup?: (page: Page) => Promise<void>;
+}
+
 /**
  * Registers Playwright tests that navigate to `url`, apply each theme,
  * and capture full-page screenshots at all standard viewports.
  *
  * @param url         The path to screenshot (e.g. '/', '/persons', '/admin')
  * @param featureName Used as the output directory name and screenshot file prefix
+ * @param options     Optional setup callback and other options
  */
-export function captureProofshots(url: string, featureName: string): void {
+export function captureProofshots(
+	url: string,
+	featureName: string,
+	options?: ProofshotOptions
+): void {
 	const outDir = path.join(__dirname, '../../proofshot-artifacts', featureName);
 	fs.mkdirSync(outDir, { recursive: true });
 
 	for (const vp of viewports) {
 		for (const theme of ['light', 'dark'] as const) {
 			test(`${featureName} – ${vp.name} – ${theme}`, async ({ page }) => {
+				// Run optional setup before main navigation (e.g. seed localStorage)
+				if (options?.setup) {
+					await options.setup(page);
+				}
+
 				await page.setViewportSize({ width: vp.width, height: vp.height });
 				await page.goto(url);