Cleanup of unused imports and variables

[jurgenwigg]

I've executed autoflake to remove unused things and make code cleaner.

[nocomplexity]

Thank you for taking the time to submit this PR — it’s much appreciated!

Unfortunately, I won’t be able to merge it as it stands. The main reasons are:

• Some imports are intentionally included for their side effects, so removing them changes behaviour.
• Applying these changes across the codebase would introduce a number of unintended side effects, which would require significant effort to resolve.

In general, autoflake can be helpful for very simple clean-ups. However, it isn’t perfect and can miss important context-specific details, particularly in a larger codebase like this.

Thanks again for your contribution!