fix(tray): 托盘恢复主窗口按系统版本选择激活选择器，修复 macOS 13 及更早系统崩溃 - #238

Description

Fixes a reproducible crash when restoring the main window from the system tray on macOS 13 and earlier.

Root cause. main/src/window_visibility.rs called NSApplication.activate() unconditionally. Per Apple's AppKit Release Notes for macOS 14, activate(ignoringOtherApps:) is deprecated in macOS 14 and a new activate method was added in that release. Info.plist declares LSMinimumSystemVersion = 12.0, so on macOS 12/13 the selector does not exist and the message goes through doesNotRecognizeSelector: → std::terminate → SIGABRT.

User report. X86-64 / macOS 12.7.6 (MacBookPro11,4) / navop 0.18.3, uncaught Objective-C exception EXC_CRASH (SIGABRT) with frames __exceptionPreprocess → objc_exception_throw → ___forwarding___ → _CF_forwarding_prep_0. Reproducible: open an SSH terminal window → minimize to tray → restore. The regression was introduced with the tray feature in 0.18.3, and this call site is the only place in the repository using that selector.

Fix. Dispatch on runtime selector availability instead of hard-coding the new API:

if app.respondsToSelector(sel!(activate)) {
    app.activate();          // macOS 14+
} else {
    activate_legacy(app);    // macOS 13 and earlier
}

The legacy path calls activateIgnoringOtherApps: and is isolated in its own #[allow(deprecated)] function so the deprecated API is confined to one call site. Both branches run on systems that natively support them.

No UI change, so no screenshots are attached.

How to Test

• cargo check -p main — passes.
• cargo test -p main --bin navop window_activation — 1 passed; 0 failed. The new source-level guard test asserts that availability is checked, that the legacy fallback still exists, that the new selector is only reached after the check, and that callers do not bypass the helper.
• Not verified on a real macOS 12/13 machine — the author is on macOS 27. A macOS 12/13 machine should verify the reported path: open an SSH terminal window → minimize to tray → restore the main window. Previously this crashed every time.

Checklist

• I have read the CONTRIBUTING document and followed the guidelines.
• Reviewed the changes in this PR and confirmed AI generated code (If any) is accurate.
• Passed cargo run for story tests related to the changes.
• Tested macOS, Windows and Linux platforms performance (if the change is platform-specific)