fix(message): correct delta/message selection when both exist in stream

[gene9831]

• Add objectDataIsValid helper to detect non-empty objects with truthy values
• Prefer choice.delta over choice.message when delta has valid data
• Fallback to choice.delta || choice.message || {} when neither is valid

Summary by CodeRabbit

• Bug Fixes
  • Improved message data handling to prevent empty object processing and better manage edge cases during message delta application.

[coderabbitai]

Walkthrough

A TypeScript utility file in the Vue message module is updated to add an internal validation helper and refine message data selection logic. The new objectDataIsValid function checks if objects contain truthy properties, and the data selection now prioritizes choice.delta over choice.message with explicit fallback behavior, improving robustness when processing message updates.

Changes

Cohort / File(s)	Summary
Message Delta Validation packages/kit/src/vue/message/useMessage.ts	Introduces objectDataIsValid helper to validate non-empty objects. Replaces direct message-or-delta selection with explicit priority logic: prefer validated delta, fallback to message, then empty object. Strengthens guard against empty data in message delta application.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A helper bunny hops in with care,
Checking objects everywhere!
Delta's preferred, message's near,
Validation magic made crystal clear! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main fix: correcting the selection logic between delta and message fields when both exist in the stream, which aligns with the core change of adding data validation and proper fallback handling.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment

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