🐞 Search Results Limited to Single Line Previews

### Description

Currently, search results only preview a single line, which often doesn't provide enough context.

### To Reproduce

1. Navigate to the search tab.
2. Enter a search term that is quite long.

### Expected Behavior

### Version Information

CodeEdit: 0.1.0
macOS: 14.4.1
Xcode: 15.3

### Additional Context

_No response_

### Screenshots

_No response_

从搜索选项卡开始，在报告的 CodeEdit 版本上使用较长的搜索词重现该问题。将当前的单行预览与预期的屏幕截图进行比较；当搜索结果提供其中显示的额外上下文，同时不丢失现有的搜索行为时，即表示完成。

由索引模型根据 Issue 内容生成。