test: add frontend dashboard, campaign, review, and wallet coverage

[brentthomas248]

Summary

• Add dashboard package-list tests for loading, error, empty, and populated states.
• Add campaign page tests for create, status filtering, pause/resume updates, and archive actions.
• Add verification review tests for queue states, date filter clearing, approve/reject/resubmission actions.
• Add WalletConnect tests for Freighter connect, connected display/disconnect, and rejected connection handling.

Closes #103

Verification

• PASS: npm test -- --runInBand --runTestsByPath src/components/dashboard/__tests__/FilteredPackageList.test.tsx 'src/app/[locale]/campaigns/__tests__/page.test.tsx' src/components/verification-review/__tests__/ReviewQueue.test.tsx src/components/verification-review/__tests__/ReviewFiltersBar.test.tsx src/components/verification-review/__tests__/ReviewActionDialog.test.tsx src/components/__tests__/WalletConnect.test.tsx (6 suites, 20 tests)
• PASS: npx eslint src/components/dashboard/__tests__/FilteredPackageList.test.tsx 'src/app/[locale]/campaigns/__tests__/page.test.tsx' src/components/verification-review/__tests__/ReviewQueue.test.tsx src/components/verification-review/__tests__/ReviewFiltersBar.test.tsx src/components/verification-review/__tests__/ReviewActionDialog.test.tsx src/components/__tests__/WalletConnect.test.tsx
• PASS: git diff --cached --check
• PASS: npm run type-check

Baseline Notes

• npm test -- --runInBand still fails existing src/components/__tests__/EvidenceArtifactViewer.test.tsx because the test expects 1/1/2024, while the local timezone renders 12/31/2023.
• npm run lint still fails existing production lint issues outside the added tests, including react-hooks/set-state-in-effect, no-explicit-any, and DashboardContent hook-order/compiler warnings.