Parent: Improve Events Highlight Section on Landing Page

[GenDelta]

Requirements

• Improve the events highlight section of the landing page to present CodeX events more clearly and engagingly.
• Define the detailed design and implementation scope through focused child issues.
• Follow existing repository conventions and reuse components where practical.

Acceptance Criteria

• The landing page events highlight enhancement is documented through actionable child issues.
• The improved section follows the site's existing visual and technical conventions.
• The section remains responsive and accessible across supported screen sizes.
• The landing page builds successfully after the enhancement.