Fix abnormal GPU usage on macOS with vibrancy effects

[Copilot]

Description

macOS with vibrancy effects enabled causes excessive GPU usage (>70%) when the launcher window is open, normalizing only when minimized. This occurs particularly on Apple Silicon Macs running recent macOS versions.

Changes

Electron renderer optimization:

• Added backgroundThrottling: true to all webPreferences configurations to throttle animations/timers when windows are backgrounded

macOS-specific Chromium flags:

• Disabled CalculateNativeWinOcclusion feature on Darwin platform to eliminate unnecessary GPU cycles from window occlusion detection
• This flag is particularly expensive with macOS compositor vibrancy effects

Technical Context

The vibrancy sidebar effect on macOS triggers continuous compositor repaints. Chromium's native window occlusion detection compounds this by performing GPU-intensive calculations on each frame. Disabling this feature trades marginal window management optimization for substantial GPU usage reduction.

Expected GPU usage: 10-20% (down from 70%+)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>macOS 26 中的异常GPU占用</issue_title>
<issue_description>### 是否已经有人报告过这个问题？

• 我已经搜索过现有的问题

启动器版本

0.53.1

操作系统

Mac

架构

ARM

当前行为

打开启动器窗口时，GPU占用率异常升高

期望行为

GPU占用10～20%

复现步骤

在Mac Mini 2024 上使用macOS 26 打开启动器即触发
最小化后恢复正常

其他信息？

No response</issue_description>

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

• Fixes macOS 26 中的异常GPU占用 #1212

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