test: cover verifier reject history flow

[zhangquanshen123-droid]

Summary

• Adds stronger integration coverage for the verifier reject path from queue detail through history.
• Verifies rejection notes are required before confirmation.
• Verifies the rejected task is removed from the pending queue and persisted in validation history with rejected status and notes.
• Adds a global window.matchMedia test stub so components using Tooltip/StatusChip render reliably in jsdom.

Closes #491.

Tests

• npx vitest run src/pages/__tests__/verifierFlow.integration.test.tsx --coverage=false
• npx eslint src/pages/__tests__/verifierFlow.integration.test.tsx src/setupTests.ts

Notes

• npm run build currently fails on existing repository-wide TypeScript issues outside this patch, including missing Vitest globals in unrelated tests, existing unused imports, and existing type errors in Analytics/VaultTransactions/VerifierDashboard.
• npm run lint currently fails on existing repository-wide lint issues outside this patch; the two changed files pass targeted ESLint.