feat: map conversational input to attachments for nodes [JAR-9193]

[norman-le]

https://uipath.atlassian.net/browse/JAR-9193

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[Copilot]

Pull request overview

This PR adds support for mapping conversational input attachments to agent nodes, enabling file attachments to be accessible throughout multi-turn conversations.

Changes:

• Refactored UiPath message conversion to combine multiple content parts into single LangChain messages with attachment metadata
• Added attachment parsing from conversation message metadata to populate job_attachments in conversational mode
• Fixed streaming leak in analyze_files_tool by disabling streaming for internal LLM calls

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pyproject.toml	Version bump to 0.5.49
uv.lock	Lockfile update for version 0.5.49
src/uipath_langchain/runtime/messages.py	Refactored message mapping to support attachments from external content parts, combining multiple content parts into single messages with attachment metadata
src/uipath_langchain/agent/react/job_attachments.py	Added parse_attachments_from_conversation_messages to extract attachments from HumanMessage metadata
src/uipath_langchain/agent/react/init_node.py	Integrated attachment parsing in conversational mode to merge attachments from preserved messages
src/uipath_langchain/agent/tools/internal_tools/analyze_files_tool.py	Fixed streaming by creating non-streaming LLM copy to prevent AIMessageChunk events from leaking
tests/runtime/chat_message_mapper.py	Updated tests for refactored message mapping, added tests for attachment handling and role-based message type conversion
tests/agent/react/test_job_attachments.py	Added comprehensive tests for parse_attachments_from_conversation_messages
tests/agent/react/test_init_node.py	Added test for attachment merging in conversational mode
tests/agent/tools/internal_tools/test_analyze_files_tool.py	Added model_copy mock for LLM fixture