fix(e2e): fix Playwright E2E test suite for CI

- Replace __dirname with fileURLToPath(import.meta.url) for ESM compatibility
- Start SvelteKit dev server on port 3000 with 120s webServer timeout
- Add data-hydrated attribute (set in onMount) so tests wait for hydration
- Fix nav active class assertions: text-brand-navy (not border-brand-navy)
- Fix filter button selector: exact match to avoid matching "Alle Filter löschen"
- Fix date validation test: use pressSequentially('99') to trigger dateInvalid
- Fix person/document search: navigate directly to URL with query param
  (avoids debounced oninput → goto race condition in CI)
- Fix heading selector: level: 1 to avoid strict-mode with h1+h2 on page
- Fix auth redirect: return 401 from handleFetch instead of throwing redirect

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

frontend/src/routes/persons/new/+page.svelte

@@ -93,7 +93,7 @@ let { form } = $props();
 				type="submit"
 				class="rounded bg-brand-navy px-6 py-2 text-sm font-bold tracking-widest text-white uppercase transition-colors hover:bg-brand-navy/80"
 			>
-				Speichern
+				Erstellen
 			</button>
 		</div>
 	</form>