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, 3 insertions, 3 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 8d552284..0f8eb8d2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4857,7 +4857,7 @@ dependencies = [
  "url",
  "urlencoding",
  "uuid",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
  "zellij-utils",
 ]
 
@@ -4907,7 +4907,7 @@ dependencies = [
  "vte 0.11.0",
  "wasmi",
  "wasmi_wasi",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
  "zellij-utils",
 ]
 
@@ -4983,7 +4983,7 @@ dependencies = [
  "url",
  "uuid",
  "winapi",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]