Windows support: release binaries + testing

[kiyeonjeon21]

Context

snact currently builds and releases for macOS and Linux only (4 targets):

• x86_64-apple-darwin
• aarch64-apple-darwin
• x86_64-unknown-linux-gnu
• aarch64-unknown-linux-gnu

The codebase has partial Windows support (find_chrome() includes Windows Chrome paths), but it has never been tested on Windows.

What's needed

1. Release workflow

Add Windows targets to .github/workflows/release.yml:

• x86_64-pc-windows-msvc
• aarch64-pc-windows-msvc (optional)

2. install script

install.sh is bash-only. Windows users would need either:

• A PowerShell install script (install.ps1)
• Or cargo install instructions

3. Testing

• Chrome discovery (find_chrome() in crates/snact-cdp/src/browser.rs)
• Data directory paths (dirs::data_local_dir())
• Process management (kill commands in crates/snact-cli/src/cmd/browser.rs — currently Unix-only)
• Idle-timeout watchdog (shell script — needs PowerShell or native equivalent)
• General snap/read/click/fill workflow on Windows Chrome

4. Known issues to address

• browser.rs uses Unix kill -0 and kill for process management — needs Windows equivalent
• Idle-timeout watchdog spawns a sh script — won't work on Windows
• install.sh uses uname — Windows-incompatible

Notes

I don't use Windows, so I can't test this myself. Contributions welcome — even partial progress (e.g. just getting the build working) would be helpful.