feat: Add ErrorPopover for Real-Time Regex Syntax Validation

[jouchaib2020]

This update improves the regex learning journey by providing users with immediate syntax validation feedback, thereby enhancing the overall learning experience .

Changes

• Introduced the ErrorPopover component to display regex syntax errors.
• Implemented text color change from green to red when regex syntax is incorrect for real-time feedback on regex validity.
• Utilizes the newly added error icon for clear error indication.

[aykutkardas]

Could you add a screenshot?

[jouchaib2020]

Yes :)