Fix: Prevent color codes in output files

[google-labs-jules]

This change prevents ANSI color codes from being written to output files.

The colored crate is used to add color to the output. The mechanism to disable it for file output wasn't working as expected. This change fixes the issue by disabling the color override before the output is generated.

This change also includes:

• A new test case that writes colored text to a temporary file and asserts that the file does not contain any ANSI color codes.
• A fix for the unrelated CLI test failures, which were caused by a timezone mismatch.
• A fix for a related bug in summary.rs that was discovered while updating the tests.

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PR created automatically by Jules for task 14334181072857013988 started by @hiqua

[google-labs-jules]

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