🌱 Memoize cutoff in ClusterChangelog

[kubestellar-hive]

Fixes #13967

Wraps the Date.now()-based cutoff in useMemo with [timeRange] dependency, preventing the downstream changeEvents memoization from being invalidated every render.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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✅ 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.

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Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit 57c70081a50caf9c37a1a35e45ae25922a58200a.