Add Playwright coverage for critical UI/API regressions

[SoftFx]

Goal

Add a focused Playwright coverage pack for high-value regressions around sensor data visibility, users management, access keys, and auth/navigation.

Suggested scenarios

1. Enum sensor visible in history

   • Create/send enum sensor value through API/collector path.
   • Open history/table UI.
   • Verify the enum value is visible.
   • Regression target: enum data can be saved but disappear from history serialization/UI.

2. Users edit flow

   • Create a test user.
   • Edit role/password in the current Users modal.
   • Reload Users page.
   • Verify changes persisted.
   • Clean up the user.

3. Access key sends sensor value

   • Create/select product from UI.
   • Open Access Keys, obtain default/new key.
   • Send a simple sensor value through public API.
   • Verify it appears in UI/history.

4. Basic auth/session guard

   • Login persists across reload/navigation.
   • Logout works.
   • Protected page redirects unauthenticated user to login.

Notes

Keep this as a small, stable e2e pack. Prefer reusable helpers similar to src/tests/Autotests/users.ts, deterministic test data, and cleanup so tests can be rerun locally without manual reset.

Acceptance criteria

• New Playwright specs run locally against the test container.
• Tests are repeatable and clean up created users/products where possible.
• Existing Playwright suite remains green.