Fix Windows file time conversion (from FILETIME to unix time)

[adithya-n05]

Hi Andy! I'm Adithya, I met you on Thursday earlier this week

I wanted to practice contributing to some open source projects like you suggested, and I thought I'd start by contributing to dust!

This PR fixes the following:

• For windows machines, dust reads time values in platform.rs as FILETIME values. Those are 100 nanosecond intervals since 1601 (i.e. not unix timestamps)
• These will be later passed to chrono by calls to get_pretty_file_modified_time in display.rs and here chrono will expect unix time

Correction:

• Added a conversion function to convert filetime to unix timestamps if on a windows machine, and tests. Replaced all timestamp reads to call this function.

[Copilot]

Pull request overview

Fixes Windows timestamp handling by converting NTFS FILETIME (100ns ticks since 1601) into Unix epoch seconds before those values are used for filtering and for chrono-based formatting, preventing incorrect time behavior on Windows.

Changes:

• Added a Windows-only FILETIME -> Unix seconds conversion helper and applied it to all Windows metadata time reads.
• Added Windows-only integration tests covering --filetime modified output and --mtime filtering behavior.

Reviewed changes

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

File	Description
tests/test_flags.rs	Adds Windows-specific integration tests for --filetime and --mtime.
src/platform.rs	Converts Windows metadata timestamps from FILETIME to Unix epoch seconds before returning them.

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[bootandy]

Hi yes I remember you.

In advance I'm not reliably online so I apologise in advance if I don't reply.

It would be good to have someone looking after the windows build - because I don't have a windows box myself.

[bootandy]

i think your reasoning is ok but the tests currently fail. I think the copilot review comments are worth looking at.

[adithya-n05]

@bootandy I've fixed the failing tests and addressed the copilot feedback

When you may have a chance, could you please approve the workflow so CI can run again?