fix(cli2): handle --help and --version flags properly

[devin-ai-integration]

Summary

Fixes --help and --version CLI flags not working in the desktop app.

Root cause: The tauri-plugin-cli converts clap's DisplayHelp and DisplayVersion errors into Ok(Matches) with "help" and "version" keys in matches.args. The existing entrypoint function only checked for subcommands and ignored these special keys, so --help/--version would silently do nothing.

Fix: Added handling at the start of entrypoint() to check for these keys, print the appropriate output, and exit cleanly.

Verified on Linux

Release build tested successfully:

$ ./target/release/desktop --help
Hyprnote

Usage: desktop [COMMAND]

Commands:
  changelog  Open the changelog page
  bug        Open GitHub issues page to report a bug
  web        Open https://hyprnote.com
  help       Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help (see a summary with '-h')
  -V, --version  Print version

$ ./target/release/desktop --version
Hyprnote Dev 0.0.0

Review & Testing Checklist for Human

• Verify the version output format ({name} {version}) is acceptable - could be changed to just {version} if preferred
• Test that existing subcommands still work: hyprnote bug, hyprnote web, hyprnote changelog
• Note: Cargo.lock shows an unrelated tauri-plugin-importer addition - verify this is expected or revert if not
• Test on macOS if that's your primary platform (I tested on Linux)

Notes

• The fix uses std::process::exit(0) which is standard for CLI help/version handling
• There's an unused handle_cli_matches function in ext.rs that attempted similar logic but was never called - could be cleaned up in a follow-up

Link to Devin run: https://app.devin.ai/sessions/55712bc7389c4dc6b78c0dded19003c0
Requested by: yujonglee (@yujonglee)

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