type: move mutate type annotation into useCallback generic

[li-jia-nan]

• Refactored boundMutate type definition
  • Improved type consistency within hooks
  • No logic changes; purely type-related refactor, confirmed no runtime changes

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[Copilot]

Pull request overview

Refactors the boundMutate type definition inside the core useSWRHandler implementation by moving the type annotation from the variable declaration to the useCallback generic. This keeps boundMutate typed as SWRResponse<Data, Error>['mutate'] while leaving runtime behavior unchanged.

Changes:

• Move boundMutate type annotation into useCallback<...> generic to keep the callback result typed correctly.
• Keep boundMutate’s public type aligned with SWRResponse<Data, Error>['mutate'] without changing the callback body.

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