[ObedChibunna]

Summary

Add Vitest and Testing Library coverage for admin account, charge, refund, split, and settlement pages, including success and failure states, validation, confirmation, and money movement actions. Ensure app/admin coverage exceeds 60%.

Adds component tests for admin accounts, charge, credits, payments, refunds, splits, and settlements. Covers key success and failure paths, including charge confirmation, refund validation, split totals, and settlement actions. Adds missing loading and error states where needed. These checks help catch regressions in admin workflows that move money.

Contracts checklist

If this PR touches anything under contracts/, confirm it against the
pre-deployment security checklist before
requesting review:

• make audit (CT-72 require_auth() coverage) passes.
• Every amount-handling path uses checked arithmetic (CT-73) — no raw
  +/- on amounts.
• Not applicable — this PR does not touch contracts/.

Test plan

npm run test:cov — 159 tests passed; admin statement coverage: 79.41%.
npm run lint — passed with existing warnings.
npm run typecheck — passed.
NEXT_PUBLIC_API_URL=http://localhost:6000 npm run build — passed.
CI=true npm run test:e2e — 2 tests passed.
git diff --check — passed.

npm run test:cov — 159 tests passed; admin statement coverage: 79.41%.
npm run lint — passed with warnings.
npm run typecheck — passed.
npm run build — passed.
npm run test:e2e — 2 tests passed.
git diff --check — passed.

CLOSES #1989

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