frontend: authchooser: expand auth flow stories

[mahmoudmagdy1-1]

Summary

This PR adds more AuthChooser story coverage by expanding auth flow states in Storybook.

Related Issue

Fixes #4685

Changes

• Updated AuthChooser.stories.tsx with auth method selection, token-only, loading, failure, and redirect coverage states.
• Added container-based auth failure and redirect stories with MSW.

Before:

-----------|---------|----------|---------|---------|-------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
-----------|---------|----------|---------|---------|-------------------
All files  |     4.1 |       15 |   14.28 |     4.1 |                   
 index.tsx |     4.1 |       15 |   14.28 |     4.1 | 58-227            
-----------|---------|----------|---------|---------|-------------------

After:

-----------|---------|----------|---------|---------|---------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s         
-----------|---------|----------|---------|---------|---------------------------
All files  |   79.45 |    68.33 |   64.28 |   79.45 |                           
 index.tsx |   79.45 |    68.33 |   64.28 |   79.45 | 79-80,101,161-173,211-227 
-----------|---------|----------|---------|---------|---------------------------

[k8s-ci-robot]

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