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Justin ChenandCopilot
02e057f92a
* Improve CSS selector performance safeguards Replace non-codicon class substring selectors with stable markers, remove disconnected editor header styles, and prevent new high-cost selector patterns. Add a repeatable Modern UI CSS benchmark and document the observed results and limitations. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: aa457496-6844-4e4c-b182-07866a0a7506 * Fix CSS performance CI checks Move process-exit error propagation outside benchmark cleanup and use the repository's preferred string quoting in the selector regression test. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: aa457496-6844-4e4c-b182-07866a0a7506 * Address CSS performance review feedback Ensure benchmark setup failures retain a diagnostic summary artifact and exclude test fixture paths from the production-only class substring selector safeguard. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: aa457496-6844-4e4c-b182-07866a0a7506 --------- Copilot-Session: aa457496-6844-4e4c-b182-07866a0a7506