[feat]: 4.0的图标在macOS下背景不协调

Problem

加个白色背景吧，不然这图标背景是个默认的灰色，有点别扭。

Proposed solution

加个白色背景

Alternatives considered

No response

Additional context

No response

Validations

• I have searched the existing issues and this feature has not been requested before.
• I have read the Contributing Guide and understand that new features require an approved issue before a PR is submitted.
• This request belongs to the Rayburst desktop app, not the browser extension, download engine, or a usage question.