feat: windows support

[godnight10061]

Checklist

check the box if it is not applicable to your changes

• I have updated the README with the necessary documentation
• I have added unit tests
• I have added integration tests (tests/)
• I have linked all related issues or PRs

Description of the changes

Summary:

• Improve Windows compatibility by gating unix-only deps and keeping tmux integration unix-only (module + --tmux flag).
• Execute commands via a platform shell (cmd.exe /C on Windows, sh -c on Unix).
• Use cmd-friendly quoting for placeholder expansion on Windows (double quotes).
• Use a platform-specific default command for filter mode (dir /s /b on Windows, find . on Unix).
• Add a filter-mode E2E regression test for --cmd / --filter.

Testing (local, Windows):

• cargo fmt --check
• cargo clippy
• cargo nextest run --release --features test-utils

Testing (fork CI):

• Build & Test workflow passed.

Fixes #293

[LoricAndre]

Don't sell yourself short, this is definitely a feature. Thanks for taking a look !

In the meantime, I'll try to think about some way to run tests without needing tmux, probably using cargo-insta and Ratatui's TestBackend

[godnight10061]

Made tmux support Unix-only (module gated with cfg(unix) and the --tmux clap flag hidden on non-Unix). On Windows, passing --tmux is rejected, and tests/e2e_filter.rs asserts both behaviors.

[ibhagwan]

In the meantime, I'll try to think about some way to run tests without needing tmux, probably using cargo-insta and Ratatui's TestBackend

@LoricAndre, out of curiosity, do you use tmux to also test colored output?

[LoricAndre]

Yes, but the tests involving ANSI coloring are very tedious and prone to break quite easily, since the actual escape codes will vary depending on the platform and/or terminal emulator. I migrated most of our tests to use ratatui's testbackend and cargo-insta but those cannot capture colors AFAIK unfortunately

[LoricAndre]

Please make sure to rebase, I've made pretty heavy changes to the tests and they might impact you (in particular, most tests files are now cross-platform)