Mhv horizon/cutover ebrake

[kjduensing]

Summary

Adds an emergency cutover lock ("e-brake") mechanism for Oracle Health (OH) migration. When the backend signals that specific health tools should be locked during cutover, the app will display an error screen instead of the normal tool content, preventing veterans from accessing potentially unstable services mid-migration.

Related to https://va.ghe.com/software/va.gov-team/issues/141084

Changes

New: emergencyCutoverLock API field

• Added emergencyCutoverLock: string[] to AuthorizedServicesPayload meta and UserAuthorizedServicesData type definitions
• Parsed from the authorized services API response in getAuthorizedServices.tsx, defaulting to an empty array

New: isToolLocked utility

• Added isToolLocked(emergencyCutoverLock, parentScreen) helper in utils/ohMigration.tsx
• Maps each OHParentScreens enum value to a lock key (appointments, sm, mr, rx)
• Returns true if the tool's key is present in the lock array

Screen-level lock integration

• Appointments — renders ErrorComponent when appointments tool is locked
• Medical Records — wraps all content in a lock check; renders ErrorComponent when locked
• Prescriptions — adds lock check alongside existing downtime check
• Secure Messaging — adds lock check alongside existing downtime check

Tests

• Added unit tests for isToolLocked covering: undefined input, empty array, matching keys, non-matching keys, and multiple locked tools

Files Changed

File	Change
src/api/authorizedServices/getAuthorizedServices.tsx	Parse emergencyCutoverLock from API meta
src/api/types/AuthorizedServicesData.ts	Add emergencyCutoverLock type to payload and data types
src/screens/HealthScreen/Appointments/Appointments.tsx	Add e-brake lock check
src/screens/HealthScreen/MedicalRecordsScreen.tsx	Add e-brake lock check
src/screens/HealthScreen/Pharmacy/PrescriptionHistory/PrescriptionHistory.tsx	Add e-brake lock check
src/screens/HealthScreen/SecureMessaging/SecureMessaging.tsx	Add e-brake lock check
src/utils/ohMigration.tsx	Add isToolLocked utility and lock key mapping
src/utils/ohMigration.test.tsx	Add tests for isToolLocked

Testing

• Unit tests added for the isToolLocked utility
• Each health screen conditionally renders an ErrorComponent when its corresponding lock key is present in the emergencyCutoverLock array from the authorized services API response

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