• Stale ref capture for onSingleRowSelected in MultiSelectableContent.tsx:158 — ref is read at render time into a local variable instead of inside the click handler, so the truthiness check that decides single-select vs multi-select behavior can use a stale value
  → Read onSingleRowSelectedRef.current inside the click handler
• Stale ref capture for onRowSelected in SingleSelectableContent.tsx:103 — same pattern: ref captured at render time instead of at call time
  → Read onRowSelectedRef.current inside the onClick and onKeyDown handlers
• activeRowId / selectedId in useMemo deps causes remount on selection change in MultiSelectableContent.tsx:235 — when these values change, useMemo returns a new component type, so react-window unmounts and remounts all rows — the same flashing problem this PR fixes for other re-render triggers. Same issue in SingleSelectableContent with selectedId.
  → Move these values into refs and pass through itemData so rows re-render (cheap) rather than remount (expensive)
• Dead RenderRowType export in TableCommon.tsx:131 — no remaining importers after this change
  → Remove RenderRowType and the unused CSSProperties import

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