Replace 'import React from "react"' with direct imports of
CSSProperties and ChangeEvent. This eliminates unused imports
and follows modern React patterns where the namespace import
is not required for JSX (React 17+).
Move duplicate style definitions from trades/page.tsx and
admin/trades/page.tsx to a new tradeCardStyles export in shared.ts.
Both pages now import and use these shared styles, keeping only
page-specific styles locally. This improves maintainability and
ensures visual consistency.