Add docstring for run_in_thread

[nikochiko]

To:

• clarify the behavior
• add note that it won't work with inline functions - lambdas and closures.

[entelligence-ai-pr-reviews]

LGTM 👍

[greptile-apps]

PR Summary

This PR enhances the docstring for run_in_thread to clearly explain its multi-threading mechanism, caching behavior, and limitations with inline functions.

• Updated the documentation in /py/gooey_gui/core/state_interactions.py to clarify that run_in_thread returns None initially and later the callable's result.
• Added a note emphasizing that inline functions (lambdas/closures) won’t work due to reliance on fn.name.
• Detailed cache behavior when cache=True.

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