feat: add PendingRewardDialog, RewardConfirmDialog, and TaskConfirmDialog components

- Implemented PendingRewardDialog for handling pending reward requests.
- Created RewardConfirmDialog for confirming reward redemption.
- Developed TaskConfirmDialog for task confirmation with child name display.

test: add unit tests for ChildView and ParentView components

- Added comprehensive tests for ChildView including task triggering and SSE event handling.
- Implemented tests for ParentView focusing on override modal and SSE event management.

test: add ScrollingList component tests

- Created tests for ScrollingList to verify item fetching, loading states, and custom item classes.
- Included tests for two-step click interactions and edit button display logic.
- Moved toward hashed passwords.

frontend/vue-app/src/components/child/PendingRewardDialog.vue

@@ -0,0 +1,30 @@
+<template>
+  <ModalDialog title="Warning!" @backdrop-click="$emit('cancel')">
+    <div class="modal-message">
+      There is a pending reward request. The reward must be cancelled before triggering a new
+      task.<br />
+      Would you like to cancel the pending reward?
+    </div>
+    <div class="modal-actions">
+      <button @click="$emit('confirm')" class="btn btn-primary">Yes</button>
+      <button @click="$emit('cancel')" class="btn btn-secondary">No</button>
+    </div>
+  </ModalDialog>
+</template>
+
+<script setup lang="ts">
+import ModalDialog from '../shared/ModalDialog.vue'
+
+defineEmits<{
+  confirm: []
+  cancel: []
+}>()
+</script>
+
+<style scoped>
+.modal-message {
+  margin-bottom: 1.2rem;
+  font-size: 1rem;
+  color: var(--modal-message-color, #333);
+}
+</style>