feat: update modal close button style

[aaazh]

PR Title

feat: update modal close button style

PR Description

Background

Updated the modal close button style to improve visual consistency and enhance the overall user interaction experience.

Changes

• Optimized modal close button UI style
• Adjusted button visual presentation and alignment
• Improved consistency with current design specifications
• Refined interactive experience for the close action

Impact

• No functional logic changes
• UI-only adjustment
• No impact on existing business flow

Testing

• Verified modal close button display in different scenarios
• Confirmed close interaction works as expected
• Checked style compatibility across related modal components