fix: complete Windows target gating for sandbox launcher and seam tests

Co-authored-by: Alfonso <289616620+alfonso-aft@users.noreply.github.com>

Author: ualtinok

crates/aft/src/cli/sandbox_launch.rs

@@ -279,7 +279,7 @@ fn print_usage() {
     println!("       aft sandbox-launch --support");
 }
 
-#[cfg(test)]
+#[cfg(all(test, any(target_os = "macos", target_os = "linux")))]
 mod tests {
     use super::*;
 

crates/aft/src/sandbox_spawn.rs

@@ -30,6 +30,7 @@ use std::io::Write;
 #[cfg(unix)]
 use std::os::unix::fs::OpenOptionsExt;
 use std::path::{Path, PathBuf};
+#[cfg(unix)]
 use std::process::Command;
 use std::sync::{Mutex, OnceLock};
 
@@ -102,6 +103,7 @@ impl SpawnPlan {
     }
 
     #[cfg(test)]
+    #[cfg(unix)]
     pub(crate) fn launcher_for_test(profile: SandboxProfile, launcher_path: PathBuf) -> Self {
         Self::Launcher {
             profile,