fix: Update thread saving logic to handle existing threads and increm…

[Iamsdt]

This pull request introduces improvements to thread handling in the graph service, updates the package version, and refines unit tests. The main focus is ensuring thread information is consistently saved and tracked, enhancing reliability for both new and existing threads.

Thread management improvements:

• Updated both invoke_graph and stream_graph methods in graph_service.py to always attempt saving thread info to the database, even for existing threads. This ensures accurate tracking of last accessed time and consistent identification of newly created threads, with the meta dictionary updated accordingly. [1] [2]

Project metadata:

• Bumped the project version in pyproject.toml from 0.2.4 to 0.2.5 to reflect these updates.

Unit test maintenance:

• Removed a redundant test in test_graph_config_auth.py that checked for errors when a custom auth path does not exist, streamlining the test suite.