Fix visual style issues on layout builder

Problem/Motivation

The layout builder currently exhibits several visual issues, including a duplicated close icon on error messages, misalignment of the background color pop-up, and inconsistencies in white space within the collapse option.

Steps to reproduce

1. Configure the layout builder entity type
2. Access the layout builder page
3. Review the identified issues

Proposed resolution

• Have the fix and changes in the base VLB enhancements styles.

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ✅ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-10.0.3, varbase_layout_builder-10.1.5, varbase-9.1.7, varbase_layout_builder-10.0.58

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3488025 by ahmad khader: Fixed visual style issues on layout builder