fix: preserve Vercel text content metadata#5710
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Summary
TextContent.metadatawhen dumping user prompt text into VercelTextUIPart.provider_metadataTextContentwhen loading Vercel UI messagesThis addresses the Vercel AI adapter path described in #5679. I left the AG-UI path alone here because its text input content type does not appear to have an equivalent metadata field to round-trip through.
To verify
PYTHONUTF8=1 uv run ruff check pydantic_ai_slim\pydantic_ai\ui\vercel_ai\_adapter.py tests\test_vercel_ai.pyPYTHONUTF8=1 uv run pytest tests\test_vercel_ai.py -k "text_content_metadata_roundtrip or convert_user_prompt_part_text_content" -qPYTHONUTF8=1 uv run pyright pydantic_ai_slim\pydantic_ai\ui\vercel_ai\_adapter.py tests\test_vercel_ai.py