feat(auth): fix unrestricted route access in UI

[jescalada]

This PR fixes the route access issue (unlogged users and non-admins can no longer access any route).

The second issue, decoupling the routing and the layout (in other words, removing the common routes from /admin and refactoring them to something else, like /dashboard), will be done in a separate PR as it might be larger than expected.

It builds on top of #7, which should be merged first.

I deliberately omitted the E2E tests as the layout fix will change how routes work.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@585cda6). Learn more about missing BASE report.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage        ?   61.88%           
=======================================
  Files           ?       49           
  Lines           ?     1805           
  Branches        ?        0           
=======================================
  Hits            ?     1117           
  Misses          ?      688           
  Partials        ?        0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.