fix: production error handling for streaming JSON and A2UI parsing

[blove]

Summary

• Parser edge case tests — empty input, whitespace-only, invalid chars in EXPECT_VALUE, trailing text after valid JSON, 100K-char strings, 100-level nesting
• Classifier error recovery — errors: Signal<string[]> on ContentClassifier, all store.push() and A2UI parser/store calls wrapped in try/catch to prevent crashes from bubbling up to the chat template
• Graceful degradation — parse errors are captured but don't stop the classifier; partial results continue to render

Test plan

• 6 new parser edge case tests pass
• 2 new classifier error handling tests pass
• All existing tests continue to pass

[vercel]

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	Apr 9, 2026 5:21pm