Adds the first successful, stable Playwright integration test for the SvelteKit frontend. This test serves as a template for future UI/UX and integration tests.
Key outcomes and learnings captured in this test:
- Establishes a pattern for running tests against the high-speed 'npm run dev' server.
- Verifies critical API security header logic, including the unauthenticated bypass for lookups and account ID scavenging from localStorage.
- Solves application boot crashes in a test environment by injecting a complete, default 'ae_loc' state object into localStorage before the app hydrates.
- Demonstrates the correct, race-condition-free pattern for waiting on network requests that are handled by API mocks.
This commit also removes the old, unreliable Node.js-based scripts ('verify_jwt_logic.js', 'verify_jwt_sync.js') that these new tests replace.
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