client (Mac): fix Podman detection (must escape spaces in env args)

[davidpanderson]

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[Copilot]

Pull Request Overview

This PR updates the macOS Podman detection logic to correctly handle spaces in the BOINC Data directory when constructing the environment command prefix.

• Escape spaces in the Podman data directory path string.
• Ensure the env command prefix includes a properly formatted path.

Comments suppressed due to low confidence (2)

lib/hostinfo.cpp:381

• The escape sequence "\ " is not a valid C string escape and will trigger a warning or unintended result. If you truly need literal backslashes, use "\ " in the string, or omit the backslashes altogether since the shell quoting around %s already handles spaces.

        const char* dir = "/Library/Application\ Support/BOINC\ Data/podman";

lib/hostinfo.cpp:386

• [nitpick] Building complex shell commands with manual escaping can be error-prone; consider using an exec-family function with an argument array (e.g., execvp) to avoid manual quoting and improve safety.

        );