Fixed the selection color of a folded block #30

[wilywork]

Changes proposed This PR fixes the selection color of a folded block in the editor. Previously, the selection color was inconsistent with the theme, making it difficult to distinguish selected text within collapsed sections.

The updated color ensures better readability and consistency with the overall design.

Fixes #30

Additional context Before the fix:

After the fix:

This change enhances the user experience by improving the visibility of selected text in folded blocks, maintaining color consistency across the editor.