Fix terminal size detection when output is piped

[rongxin-liu]

This pull request updates the style50 project by simplifying how terminal size is determined and updating the package version. The main change is the replacement of a custom function for detecting terminal size with Python's built-in shutil.get_terminal_size, which reduces code complexity and removes the need for several imports.

Terminal size detection simplification:

• Replaced the custom get_terminal_size function (which used fcntl, termios, and struct) with a direct call to shutil.get_terminal_size, simplifying the logic for determining terminal dimensions.
• Removed unused imports: fcntl, struct, and termios are no longer needed due to the simplification above.

Project metadata update:

• Updated the package version from 2.10.4 to 2.11.0 in setup.py to reflect the new changes.

Closes #127

[Copilot]

Pull request overview

This PR simplifies terminal size detection so that when style50 output is piped (i.e., not connected to a TTY), diff formatting falls back to a fixed size rather than attempting to probe other streams.

Changes:

• Replace custom ioctl-based terminal sizing with shutil.get_terminal_size(fallback=(80, 24)).
• Remove low-level POSIX-specific imports used by the previous implementation.
• Bump package version to 2.11.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
style50/_api.py	Switches terminal-size detection to shutil.get_terminal_size with a fallback for non-TTY output (e.g., piped output).
setup.py	Updates package version to reflect the change.

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