Fix react-hook-form task 153: handleSubmit 3rd arg type mismatch with test

[AlienKevin]

Summary

• The combined.patch changes handleSubmit signature to (onValid, onInvalid, options) where options is an object { onFinally?: ..., onBeforeValidate?: ..., ... }
• The test patch (tests2.patch) passes onFinally as a bare function in the 3rd positional argument: handleSubmit(onValidCallback, onInvalidCallback, onFinallyCallback)
• Since the implementation checks options?.onFinally, and options is actually a function (not an object), onFinally is never invoked
• All 3 onFinally tests fail with "Expected 1 calls, received 0 calls"

Fix

Add runtime type detection for the 3rd argument in combined.patch:

const options = typeof optionsOrOnFinally === 'function'
  ? { onFinally: optionsOrOnFinally }
  : optionsOrOnFinally;

This accepts both handleSubmit(valid, invalid, onFinallyFn) and handleSubmit(valid, invalid, { onFinally: fn, ... }). The TypeScript type definition is updated to match.

Test plan

• Oracle test passes for react-hook-form task 153 (both features)
• Verified on Modal with Harbor evaluation framework