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test(coverage): achieve 100% test coverage - phase 1 critical files

Description

Increase test coverage from 94.76% to 100% by adding tests for uncovered code paths and edge cases.

Current overall coverage is 94.76%, leaving approximately 5.24% of the codebase untested. This phase focuses on improving coverage for the files with the lowest percentages.

Target Files

  • error.tsx — 73.68%
  • vendor.tsx — 76.92%
  • dForm.tsx — 76.97%
  • KYPQueuePage.tsx — 76.97%
  • aPrescriptionPage.tsx — 87.97%

Scope

  • Add unit/integration tests for uncovered lines
  • Cover conditional branches, fallback states, and edge cases
  • Improve statement, branch, function, and line coverage
  • No production/business logic changes included

Expected Outcome

  • All listed files reach 100% coverage
  • Overall project coverage increases from 94.76% → 100%
  • Estimated addition of 25–30 test cases

Validation Commands

bun run test:coverage
bun run test
bun run lint