#5 Issue: [UX] Tier Selection Cards

Description: "Display subscription tiers as distinct cards with benefits lists (e.g., 'Access to Discord', 'Exclusive Video')."

Acceptance Criteria:

[ ] Grid layout.

[ ] 'Subscribe' button with price (e.g., '5 XLM / mo').

[ ] Highlight 'Most Popular' tier.

Priority: Medium

Labels: ui, pricing