refactor(ui-react): split useCopy hook into its own file

[luizhf42]

What

Move the useCopy hook and its ClipboardContext out of
ClipboardProvider.tsx into a dedicated hooks/useCopy.ts module.

Why

ClipboardProvider.tsx exported a component, a hook, and an interface
from the same file, tripping react-refresh/only-export-components:

warning  Fast refresh only works when a file only exports components

Beyond the lint noise, the mixed exports broke HMR for the provider —
editing it triggered a full reload instead of a fast refresh.

Changes

• hooks/useCopy.ts: new home for ClipboardContext, its value type,
  and the useCopy hook. The context is exported so the provider can
  consume it.
• ClipboardProvider.tsx: now a component-only module that imports
  ClipboardContext from @/hooks/useCopy.
• CopyButton / CopyWarning / ClipboardProvider.test: import
  useCopy from @/hooks/useCopy instead of the provider file.

Testing

• npm run lint — no react-refresh warning on ClipboardProvider.tsx
• npx vitest run src/components/common/__tests__/ClipboardProvider.test.tsx src/components/common/__tests__/CopyWarning.test.tsx — 33 tests pass

[github-actions]

Claude finished @luizhf42's task in 1m 9s —— View job

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Code Review Complete

Reviewed 5 files across code quality, security, testing, language patterns, and architecture — no issues found. The code looks good as-is.

Summary: Clean mechanical refactoring that moves useCopy hook and ClipboardContext from ClipboardProvider.tsx into hooks/useCopy.ts. All import paths are correctly updated, no stale imports remain, the UseCopyResult interface is appropriately narrowed to non-exported (nothing depended on it), and the test file properly splits its imports between the two modules. This correctly fixes the react-refresh/only-export-components lint warning.

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