feat: enhance child edit and view components with improved form handling and validation

- Added `requireDirty` prop to `EntityEditForm` for dirty state management.
- Updated `ChildEditView` to handle initial data loading and image selection more robustly.
- Refactored `ChildView` to remove unused reward dialog logic and prevent API calls in child mode.
- Improved type definitions for form fields and initial data in `ChildEditView`.
- Enhanced error handling in form submissions across components.
- Implemented cross-tab logout synchronization on password reset in the auth store.
- Added tests for login and entity edit form functionalities to ensure proper behavior.
- Introduced global fetch interceptor for handling unauthorized responses.
- Documented password reset flow and its implications on session management.

frontend/vue-app/src/components/reward/RewardView.vue

@@ -52,7 +52,7 @@ const $router = useRouter()
 
 const showConfirm = ref(false)
 const rewardToDelete = ref<string | null>(null)
-const rewardListRef = ref()
+const rewardListRef = ref<InstanceType<typeof ItemList> | null>(null)
 const rewardCountRef = ref<number>(-1)
 
 function handleRewardModified(event: any) {
@@ -75,10 +75,7 @@ function confirmDeleteReward(rewardId: string) {
 }
 
 const deleteReward = async () => {
-  const id =
-    typeof rewardToDelete.value === 'object' && rewardToDelete.value !== null
-      ? rewardToDelete.value.id
-      : rewardToDelete.value
+  const id = rewardToDelete.value
   if (!id) return
   try {
     const resp = await fetch(`/api/reward/${id}`, {