Patch Changes

• c231e42: Surface LangChain citation annotations as spec-compliant source-url / source-document UI message parts. Previously, citations attached to text content blocks (e.g. from web search or RAG) were dropped entirely instead of being emitted as AI SDK source parts. Citation metadata (citedText, startIndex, endIndex, source) is preserved under providerMetadata.langchain.
• Updated dependencies [19736ee]
• Updated dependencies [d66ae02]
• Updated dependencies [e4182bd]
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