test: cover CommitmentDetailNftSection callbacks

[jakerated-r]

Summary

• add RTL coverage for CommitmentDetailNftSection NFT metadata rendering
• verify long-address truncation, empty mint-date stability, accessible copy/action controls, and all callback paths
• cover repeated copy clicks without firing neighboring callbacks

Validation

• npm ci
• npm test -- --run src/components/tests/CommitmentDetailNftSection.test.tsx
• git diff --check

Repo-wide test status

• npm test -- --run is currently red on unrelated existing failures, including duplicate declarations in src/lib/backend/validation.ts, src/lib/backend/services/contracts.ts, and src/lib/backend/auditLog.ts; invalid JSX in src/components/modals/CommitmentDetailsModal.tsx; missing @testing-library/user-event; jest usage in a Vitest file; and existing tests without DOM environments.

Refs #591

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