refactor: consolidate duplicated copy/clipboard icons and operations

[Green00101]

Summary

This PR consolidates duplicated copy/clipboard UI and logic into shared UI utilities.

Changes

• add shared CopyIcon and CheckIcon in packages/ui/components/icons/copyIcons.tsx
• add shared useCopyToClipboard hook in packages/ui/hooks/useCopyToClipboard.ts
• move the canonical CopyButton implementation to packages/ui/components/CopyButton.tsx
• keep packages/review-editor/components/CopyButton.tsx as a re-export for backward compatibility
• replace duplicated inline icons and clipboard logic in affected editor, review-editor, and ui components

Notes

• standardizes copy feedback behavior and reduces repeated SVG / clipboard code across the codebase
• closes refactor: consolidate duplicated copy/clipboard icons and operations #486