Relates to #223
## Scope
Update frontend types and components to use `sourceValue` instead of `nhtsaValue`, and update all test files.
### Frontend Changes
- Rename `nhtsaValue` to `sourceValue` in `frontend/src/features/vehicles/types/vehicles.types.ts`
- Update `VinOcrReviewModal.tsx` references to use `sourceValue`
- Update comments referencing NHTSA in frontend vehicle files
- Update guide page sections if they reference NHTSA
### Test Changes
- Update `backend/src/features/vehicles/tests/integration/vehicles.integration.test.ts`
- Add/update unit tests for VIN decode via OCR service flow
- Verify existing OCR tests are unaffected
### Acceptance Criteria
- [ ] Frontend compiles with zero NHTSA references
- [ ] VinOcrReviewModal works with sourceValue field
- [ ] All tests pass (npm test)
- [ ] Existing OCR image-based VIN extraction unaffected
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Relates to #223
Scope
Update frontend types and components to use
sourceValueinstead ofnhtsaValue, and update all test files.Frontend Changes
nhtsaValuetosourceValueinfrontend/src/features/vehicles/types/vehicles.types.tsVinOcrReviewModal.tsxreferences to usesourceValueTest Changes
backend/src/features/vehicles/tests/integration/vehicles.integration.test.tsAcceptance Criteria