feat:recent activity list

[pheobeayo]

Summary

Add the RecentActivity feed component for the merchant dashboard. Merchants can now see a live list of recent events (payments, invoices, refunds, etc.) with icons, amounts, and relative timestamps. Domain types are extracted to lib/activity.ts following the existing pattern in lib/utils.ts.

Closes #16

Changes

• src/lib/activity.ts — new file; exports ActivityEventType union and ActivityEvent type
• src/components/RecentActivity.tsx — new component; renders a vertically-stacked event feed with per-type icon badges and colour coding, relative timestamps, amount formatting, and an empty state

Verification

• npm run typecheck
• npm run format:check

Notes

[drips-wave]

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