🐞 Tab Bar and Path Bar divider and background colors too prominent

### Description

After PR #1080, the Tab Bar and Path Bar divider and background colors are now too prominent.

We need to make these colors less prominent to be consistent with Xcode.

Note: The tab bar background color may be showing through to make the divider color appear lighter. If this is the case, the divider color may not need to be changed.

You can use `.background(.bar)` to get the correct background color.

### Screenshots

Xcode

CodeEdit

首先检查 PR #1080，并找到 Tab Bar 和 Path Bar 的颜色实现。将当前的分隔线颜色和背景颜色与 Xcode 截图进行比较，测试 tab bar 背景是否会影响分隔线，并在适当的地方使用 .background(.bar)；完成的标准是颜色不那么突出，并且在视觉上与 Xcode 保持一致。

由索引模型根据 Issue 内容生成。