Description

Prevent sensitive files like .env to be not included in next edit diffs.

closes #8363

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• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Prevent sensitive files (e.g., .env) from being included in Next Edit diffs. We now skip diff creation when isSecurityConcern(filePath) returns true.

^{Written for commit c77a10a. Summary will update automatically on new commits.}