fix: allow switching existing sick/vacation policy to unlimited accrual

The update request was sending `complete: true` when switching to
unlimited, which could cause API rejection for policies with employees
that have existing balances. Now the update omits the `complete` flag
(already-created policies don't need it re-asserted) and surfaces
422 errors as human-readable messages.

Author: krisxcrash

src/components/TimeOff/TimeOffManagement/PolicyConfigurationForm/PolicyConfigurationForm.test.tsx

@@ -1003,7 +1003,6 @@ describe('PolicyConfigurationForm - edit mode (deriveFormDefaults)', () => {
             policyResetDate: null,
             accrualRate: null,
             accrualRateUnit: null,
-            complete: true,
           }),
         },
       })

src/components/TimeOff/TimeOffManagement/PolicyConfigurationForm/PolicyConfigurationForm.tsx

@@ -5,13 +5,17 @@ import { useTimeOffPoliciesGetSuspense } from '@gusto/embedded-api/react-query/t
 import type { TimeOffPolicyRequest } from '@gusto/embedded-api/models/components/timeoffpolicyrequest'
 import type { TimeOffPolicy } from '@gusto/embedded-api/models/components/timeoffpolicy'
 import type { PutV1TimeOffPoliciesTimeOffPolicyUuidRequestBody } from '@gusto/embedded-api/models/operations/putv1timeoffpoliciestimeoffpolicyuuid'
+import { UnprocessableEntityError } from '@gusto/embedded-api/models/errors/unprocessableentityerror'
 import { useQueryClient } from '@tanstack/react-query'
+import { useTranslation } from 'react-i18next'
 import { PolicyConfigurationFormPresentation } from './PolicyConfigurationFormPresentation'
 import type { PolicyConfigurationFormData } from './PolicyConfigurationFormTypes'
 import { BaseComponent, type BaseComponentInterface } from '@/components/Base'
 import { useBase } from '@/components/Base/useBase'
+import { SDKInternalError } from '@/types/sdkError'
 import { componentEvents } from '@/shared/constants'
 import { formatMonthDay } from '@/helpers/dateFormatting'
+import { useI18n } from '@/i18n'
 
 export interface PolicyConfigurationFormProps extends BaseComponentInterface<'Company.TimeOff.CreateTimeOffPolicy'> {
   companyId: string
@@ -166,7 +170,6 @@ function buildUpdateRequestBody(
       accrualRate: null,
       accrualRateUnit: null,
       policyResetDate: null,
-      complete: true,
     }
   }
 
@@ -266,7 +269,9 @@ interface EditRootProps {
 }
 
 function EditRoot({ companyId, policyType, policyId, defaultValues }: EditRootProps) {
+  useI18n('Company.TimeOff.CreateTimeOffPolicy')
   const { onEvent, baseSubmitHandler } = useBase()
+  const { t } = useTranslation('Company.TimeOff.CreateTimeOffPolicy')
   const queryClient = useQueryClient()
 
   const { data: policyResponse } = useTimeOffPoliciesGetSuspense({
@@ -287,12 +292,23 @@ function EditRoot({ companyId, policyType, policyId, defaultValues }: EditRootPr
       await baseSubmitHandler(data, async () => {
         const requestBody = buildUpdateRequestBody(data, policyType, version)
 
-        await updateTimeOffPolicy({
-          request: {
-            timeOffPolicyUuid: policyId,
-            requestBody,
-          },
-        })
+        try {
+          await updateTimeOffPolicy({
+            request: {
+              timeOffPolicyUuid: policyId,
+              requestBody,
+            },
+          })
+        } catch (err) {
+          if (err instanceof UnprocessableEntityError) {
+            const messages = err.errors.map(e => e.message).filter(Boolean)
+            throw new SDKInternalError(
+              t('errors.updatePolicyFailed', { details: messages.join('. ') }),
+              'api_error',
+            )
+          }
+          throw err
+        }
 
         void queryClient.invalidateQueries({
           queryKey: ['@gusto/embedded-api', 'timeOffPolicies', 'get'],
@@ -304,7 +320,16 @@ function EditRoot({ companyId, policyType, policyId, defaultValues }: EditRootPr
         })
       })
     },
-    [baseSubmitHandler, policyId, policyType, version, updateTimeOffPolicy, queryClient, onEvent],
+    [
+      baseSubmitHandler,
+      policyId,
+      policyType,
+      version,
+      updateTimeOffPolicy,
+      queryClient,
+      onEvent,
+      t,
+    ],
   )
 
   const handleCancel = useCallback(() => {

src/i18n/en/Company.TimeOff.CreateTimeOffPolicy.json

@@ -81,7 +81,8 @@
   "backCta": "Back",
   "cancelCta": "Cancel",
   "errors": {
-    "updatePolicySettingsFailed": "Unable to update policy settings. {{details}}"
+    "updatePolicySettingsFailed": "Unable to update policy settings. {{details}}",
+    "updatePolicyFailed": "Unable to update this policy. {{details}}"
   },
   "flash": {
     "policyUpdated": "Details for this policy have been updated.",