🐛 [scanner] fix: handle null images in buildpacks coverage test

[clubanderson]

Fixes #19334

This PR fixes the failing test in the buildpacks-coverage test suite by making two changes:

1. Test fix: Added missing status: 200 property to the mock fetch response in the "null images in response" test. The hook checks response.status === 404, so the mock needs a status property.

2. Hook fix: Fixed infinite loop caused by empty array not being considered valid cached data. Changed cache validation from buildpackCache.data.length > 0 to buildpackCache.timestamp > 0. An empty array is valid cached data and should not trigger repeated refetches.

Root cause: When the API returned null for images (which correctly defaulted to [] via data.images || []), the empty array was cached, but the cache validation logic considered it invalid because length === 0. This caused the useEffect to repeatedly call refetch(), creating an infinite loop manifested as "Maximum update depth exceeded" errors.

Testing: All 5 tests in buildpacks-coverage.test.ts now pass.

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[github-actions]

✅ Test Coverage Check

All new source files in this PR have corresponding test files.

Checked web/src/hooks/ and web/src/components/ against origin/main.

[Copilot]

Pull request overview

This PR fixes a failing buildpacks coverage test and resolves an infinite refetch loop in the useBuildpackImages MCP hook by treating an empty cached array as valid cached data (when a real cache timestamp exists).

Changes:

• Update cache validation in useBuildpackImages to use buildpackCache.timestamp > 0 (instead of data.length > 0) so cached empty arrays don’t trigger repeated refetches.
• Fix the “null images in response” test mock to include status: 200, matching the hook’s reliance on response.status.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
web/src/hooks/mcp/buildpacks.ts	Fixes cache-validity logic to prevent infinite refetch when cached images are [].
web/src/hooks/mcp/__tests__/buildpacks-coverage.test.ts	Updates fetch mock to include an HTTP status code for the null-images test case.

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Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit 1953a58c1ed3303f28eaf939f5817c766de155cf.

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✅ Post-Merge Verification: passed

Commit: 1953a58c1ed3303f28eaf939f5817c766de155cf
Specs run: smoke.spec.ts
Report: https://github.com/kubestellar/console/actions/runs/27896229675