Sync app menu bar visibility state with macOS 15 system controls

[Copilot]

macOS 15 introduced system-level menu bar icon controls (Settings > Desktop & Dock > Menu Bar). When the system toggles Easydict's icon to visible, the app's internal hideMenuBarIcon setting remains stale, causing state desync.

Changes

• Added onAppear handler to MenuBarExtra label that detects system-initiated visibility changes
• When label appears while hideMenuBarIcon is true, sync internal state to false
• Guarded with @available(macOS 15.0, *) for backward compatibility

Implementation

.onAppear {
    syncMenuBarVisibilityIfNeeded()
}

private func syncMenuBarVisibilityIfNeeded() {
    guard #available(macOS 15.0, *) else { return }
    
    if hideMenuBar {
        DispatchQueue.main.async {
            hideMenuBar = false
        }
    }
}

The fix leverages SwiftUI's lifecycle: when macOS system settings make the icon visible, onAppear fires on the label, triggering the sync. No polling required.

Original prompt

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This section details on the original issue you should resolve

<issue_title>🐞 反馈问题：MACos 26系统自带的[允许菜单栏图标显示/隐藏]，与Easydict2.16自带的[允许菜单栏图标显示/隐藏]，两者无法联动</issue_title>
<issue_description>

当macos26设置为隐藏，则Easydict状态被改为隐藏，

当macos26设置从隐藏改为显示，则Easydict状态依然为隐藏

两者无法联动

<agent_instructions>帮我检查这个问题，并修复。</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@tisfeng 很奇怪的新功能，我都没注意到。。。

感觉这里好像有新的 API 控制应用在菜单栏的图标显示，可能得去调研适配一下。</comment_new>

• Fixes 🐞 反馈问题：MACos 26系统自带的[允许菜单栏图标显示/隐藏]，与Easydict2.16自带的[允许菜单栏图标显示/隐藏]，两者无法联动 #984

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