US6 – Add Event Navigation Buttons and Breadcrumb Trail

[Entav78]

What does this PR do?

• Adds Previous/Next event navigation buttons (desktop + mobile)
• Adds breadcrumb navigation above event header

Testing

• Dummy buttons log to console for now (pending dynamic routing)
• All components styled according to design

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[Niksubishi]

Completed, approved and merged. Feedback via group chat.