fix(windows): bump windows-sys to 0.59 (#5139)

The workspace `windows-sys` constraint was pinned to 0.52 while the
Windows source uses APIs and namespaces from 0.59 (e.g. WriteFile in
Win32::Storage::FileSystem). CI built fine because Cargo.lock pinned
0.59, but downstream `cargo install`/`cargo binstall` did fresh
resolution and selected 0.52, breaking the build for users on Windows.

Align the manifest with the code:
- Bump workspace dep `windows-sys` from 0.52 to 0.59.
- HANDLE is now `*mut c_void` instead of `isize`: replace
  `handle == 0` / `!= 0` with `is_null()`, initialise HANDLE locals
  with `std::ptr::null_mut()`, and pass `null_mut()` as the
  hTemplateFile argument to CreateFileW.
- Pass the process HANDLE through the exit-monitor thread as `usize`
  (raw pointers are not Send; OS handles are safe to use cross-thread).
- Note: HPCON is still `isize` in 0.59, so its zero-init is unchanged.

1 files changed, 1 insertions, 1 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 8457d837..ddae7131 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -111,7 +111,7 @@ unicode-width = { version = "0.1.8", default-features = false }
 url = { version = "2.2.2", default-features = false, features = ["serde"] }
 uuid = { version = "1.4.1", default-features = false, features = ["serde", "v4", "std"] }
 vte = { version = "0.11.0", default-features = false }
-windows-sys = { version = "0.52", default-features = false }
+windows-sys = { version = "0.59", default-features = false }
 names = { version = "0.14.0", default-features = false }
 include_dir = { version = "0.7.3", default-features = false }
 sha2 = { version = "0.10", default-features = false }