[Windows port PR7] refactor: upgrade sysinfo and add cross-compilation proof (#4759)

* refactor: platform-abstract path constants

Add #[cfg(not(unix))] counterpart to unix_only module in consts.rs so
path constants compile on non-Unix platforms. Move nix dependency to
cfg(unix)-only in both zellij-utils and root crate.

* refactor: Windows cross-compilation proof

Enable all 5 core crates to compile for x86_64-pc-windows-gnu by fixing
dependency issues and upgrading sysinfo. This validates that PRs 1.1–7.1
correctly gated all Unix-specific code behind cfg attributes.

- Enable crossterm "windows" feature in workspace deps (no-op on non-Windows)
- Remove dead mio dependency from zellij-client (zero imports)
- Add Windows cross-compilation linker config to .cargo/config.toml
- Upgrade sysinfo 0.22.5 → 0.33 (drops ntapi v0.3.7 packed struct UB)
  - Remove deprecated ProcessExt/SystemExt trait imports
  - Pid::from(i32) → Pid::from_u32(u32)
  - process.cwd() now returns Option<&Path>
  - process.cmd() now returns &[OsString]
  - Use precise ProcessRefreshKind (nothing + with_cwd/with_cmd)

---------

Co-authored-by: divens <divens.dev@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/Cargo.toml b/Cargo.toml
index f0210685..80972838 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,11 +25,13 @@ interprocess = { workspace = true }
 log = { workspace = true }
 miette = { workspace = true }
 names = { workspace = true }
-nix = { workspace = true }
 suggest = { workspace = true }
 thiserror = { workspace = true }
 isahc = { workspace = true }
 
+[target.'cfg(unix)'.dependencies]
+nix = { workspace = true }
+
 [dev-dependencies]
 insta = { version = "1.6.0", features = ["backtrace"] }
 ssh2 = "0.9.1"
@@ -74,7 +76,7 @@ ansi_term = { version = "0.12.1", default-features = false }
 anyhow = { version = "1.0.70", default-features = false, features = ["backtrace", "std"] }
 async-trait = { version = "0.1", default-features = false }
 clap = { version = "3.2.2", default-features = false, features = ["env", "derive", "color", "std", "suggestions"] }
-crossterm = { version = "0.28", default-features = false }
+crossterm = { version = "0.28", default-features = false, features = ["windows"] }
 daemonize = { version = "0.5", default-features = false }
 dialoguer = { version = "0.10.4", default-features = false, features = ["password", "completion"] }
 humantime = { version = "2.1.0", default-features = false }