fix: add missing args to windows tauri cli spawn

[pschiel]

Fixes #8074

Cause: args missing in windows cli spawning

• When the desktop app tried to spawn the sidecar with: cli::create_command(app, "serve --port 63591")
• Expected: Run opencode-cli.exe serve --port 63591
• Actually ran: opencode-cli.exe (no arguments at all!)

Fix: add args