Wizard: let logged-out users browse and build official images

[lucasgarfield]

Registry login is no longer required to browse official images — logged-out users see the dropdown with pull disabled, and existence/auth checks stop going stale.

• Drop the login-gated empty state and "Login required" label; the image dropdown is always shown
• Logged-out users get an inline info alert offering registry login; pull buttons disabled with an explanatory tooltip
• Re-check image existence (refetchOnMountOrArgChange) on mount, so a podman rmi outside the wizard is noticed
• Re-check registry login on mount for the same staleness reason
• Scope the pull button's busy/error state to the selected image, so switching images doesn't show a stale pulling state
• Pull validation copy now tells the user how to resolve a missing image based on login state

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov]

Codecov Report

❌ Patch coverage is 74.35897% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.98%. Comparing base (cb9ad33) to head (fdc321a).

Files with missing lines	Patch %	Lines
...s/ImageSourceSelect/OnPrem/OfficialImageSource.tsx	75.86%	7 Missing ⚠️
...ents/CreateImageWizard/utilities/useValidation.tsx	50.00%	3 Missing ⚠️

@@                       Coverage Diff                        @@
##           lucas/cockpit/2-local-images    #4736      +/-   ##
================================================================
+ Coverage                         78.20%   78.98%   +0.77%     
================================================================
  Files                               264      264              
  Lines                              7021     7033      +12     
  Branches                           2542     2548       +6     
================================================================
+ Hits                               5491     5555      +64     
+ Misses                             1437     1381      -56     
- Partials                             93       97       +4     

Flag	Coverage Δ
playwright	59.78% <12.50%> (+0.71%)	⬆️
vitest	73.86% <74.35%> (+0.45%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...mponents/ImageSourceSelect/OnPrem/RegistryAuth.tsx	58.62% <100.00%> (+39.65%)	⬆️
...tput/components/ImageSourceSelect/OnPrem/index.tsx	75.00% <ø> (ø)
...ents/CreateImageWizard/utilities/useValidation.tsx	88.36% <50.00%> (-0.22%)	⬇️
...s/ImageSourceSelect/OnPrem/OfficialImageSource.tsx	77.77% <75.86%> (+21.52%)	⬆️

... and 12 files with indirect coverage changes

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[lucasgarfield]

Replaced by #4756