Narrow `ResolvedRequestOptions.headers` type to `Headers` in request interceptors#3373

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copilot/fix-request-options-headers-type

Commits on Feb 9, 2026

Initial plan
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Add ResolvedRequestOptions with narrowed headers type to custom-client

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mrlubos
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Add headers: Headers to ResolvedRequestOptions in all client bundles

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Fix SSE request interceptor headers type in client-next and cleanup unused imports

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Improve type safety of SSE requestInit by explicitly typing required properties

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Simplify type annotation in SSE onRequest per code review feedback

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Commits on Feb 10, 2026

Regenerate examples to sync with ResolvedRequestOptions type changes

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