Optimization (audited across src/, typecheck green): - Crash guards: PurchaseAuction data?.result + stray text-node, AuctionItemDetail length>0, LiveAuction user?.contractorId, KYC params guard - Hoisted render-defined components: Login MinimalInput (keyboard-focus bug), TenderFullDetail Section/InfoBox (subtree remount) - Memoized hot paths: Spreadsheet ColumnHeaderRow/DataRow, list makeStyles, shared infinite-query select (stops per-render flatMap) - Removed hot-path/in-list console logs; SkeletonList 10->1 shimmer UI/theme: themed AppToast, redesigned sidebar drawer, list empty states, KYC WebView cleanup Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>