feat(KLEF): Show loading screen while IDP plugin is starting up

[JeremyNRoos]

Pull Request

Summary

• Shows a "Starting identity provider…" loading screen on the login page while the IDP plugin container is starting up
• Polls GET /api/v1/auth/config every 3 s until ready: true, then seamlessly transitions to the login form
• Eliminates the need to manually spam login credentials while Keycloak boots

Related Issues

Closes #

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Changes

What's Included

• AuthConfig: add ready?: boolean field
• AuthProvider: poll config every 3 s when IDP is installed (!setup_required) but not yet ready (!ready)
• Login page: render a skeleton + "Starting identity provider…" message instead of the login form when ready: false

What's Not Included

• Loading state on the authenticated layout redirect path (not needed — if the user is already past login the IDP is already ready)
• Timeout / error state if the IDP never becomes ready (left for a follow-up)

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Testing

How Was This Tested?

• Tested locally: installed keycloak plugin, observed loading screen, watched it automatically transition to login form once Keycloak finished booting (~20–30 s)
• Verified ready: false → skeletons shown, ready: true → login form appears without page refresh

Test Coverage

• Unit tests added or updated
• Integration tests added or updated
• Manually tested end-to-end

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Breaking Changes

Does this PR introduce breaking changes?

• Yes
• No

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Security Considerations

• This PR affects authentication or authorization logic
• This PR touches secrets, tokens, or environment variables
• This PR affects infrastructure, deployment pipelines, or network configuration

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Documentation

Does this PR require documentation updates?

• Yes
• No

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UI/UX (If Applicable)

• Includes new components or views
• Changes styles or theme tokens
• Responsive behavior verified
• Requires design approval

Screenshots or recordings: loading skeleton with "Starting identity provider…" caption, auto-transitions to login form when ready.

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Pre-Merge Checklist

• PR title follows semantic format (feat:, fix:, chore:, docs:, refactor:, test:)
• All CI checks passing
• Code follows project style guidelines
• No debug logs or commented-out code left in
• Dependencies reviewed (no unnecessary additions)
• No sensitive information included

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Reviewer Notes