feat(ai): add onStepEnd support to toUIMessageStream - #21150
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Background
toUIMessageStreamacceptedonEndbut did not expose step-level callbacks.Summary
onStepEndand deprecatedonStepFinishtoUIMessageStreamOptionstoUIMessageStreamintohandleUIMessageStreamFinishonStepEndand precedence overonStepFinishNo docs update needed; this change adds callback passthrough parity.
End-to-End Verification
pnpm exec vitest run src/ui-message-stream/to-ui-message-stream.test.ts --config vitest.node.config.js --typecheck.enabled falseChecklist
pnpm changesetin the project root)