Flush buffered input in file::move

[bugdea1er]

Add a flush call at the beginning of file::move

[Copilot]

Pull Request Overview

This pull request ensures that files have their buffered input flushed before moving to a new location, reducing the risk of data loss. Key changes include:

• Removal of an explicit flush in the test, as the flushing is now handled within file::move.
• Addition of a flush call at the beginning of file::move.
• Minor comment update to explain the rationale behind using a copy rather than a hard link.

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/file.cpp	Removed redundant flush call in the test after shifting flush logic.
src/file.cpp	Added flush call at the beginning of file::move to ensure data is written before moving.

Files not reviewed (1)

• include/tmp/file: Language not supported