frontend: storybook: Add descriptive titles to AuthToken stories

[mastermaxx03]

Summary

Changed AuthToken story titles from generic "a title" to "Authentication Token" and "Authentication Error" to fix accessibility violations.

Related Issue

Fixes #4594, #4595

Changes

• Updated placeholder title to "Authentication Error" in the ShowError story.
• Updated placeholder title to "Authentication Token" in the ShowActions story.
• Regenerated storybook snapshots to reflect title changes.

Screenshots

Authentication Token	Authentication Error

Steps to Test

1. Run npm run storybook in the frontend directory.
2. Navigate to AuthToken in the sidebar.
3. Check ShowError and ShowActions stories to verify the titles are no longer placeholders.

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[mastermaxx03]

@illume I think the simplest solution to fix the two issues was to change the titles manually. Let me know if this works!

[illume]

Hello.

unfortunately this is not right. Have a look at this snapshot file to see the heading levels.

it should be

h1
.. h2
.. h2

I see in this snapshot that the h1 is after the h2, and that some headings are empty.