feat(tutorial): enhance help button visibility and add dialog tests

- Introduced a mechanism to hide the help button when modal dialogs are open by adding `helpButtonHidden` state in the tutorial controller.
- Updated various components to set the help button visibility based on dialog states.
- Added tests to verify help button visibility during reward and task confirmation dialogs.
- Created new E2E tests for dialog help button functionality across different assignment views.
- Refactored existing dialog components to utilize the new help button visibility logic.
- Added unit tests for `RewardConfirmDialog` and `TaskConfirmDialog` to ensure correct titles are rendered based on task type.
- Enhanced `HelpButton` component tests to validate visibility based on tutorial state.

frontend/src/components/child/__tests__/TaskConfirmDialog.spec.ts

@@ -0,0 +1,43 @@
+import { describe, it, expect } from 'vitest'
+import { mount } from '@vue/test-utils'
+import TaskConfirmDialog from '../TaskConfirmDialog.vue'
+import type { Task } from '@/common/models'
+
+const ModalDialogStub = {
+  template: '<div><slot /></div>',
+  props: ['title', 'subtitle', 'imageUrl'],
+}
+
+describe('TaskConfirmDialog', () => {
+  it('renders "Confirm Task" title for chores', () => {
+    const task: Task = {
+      id: 'task-1',
+      name: 'Clean Room',
+      type: 'chore',
+      points: 5,
+      image_id: '',
+    }
+    const wrapper = mount(TaskConfirmDialog, {
+      props: { task, childName: 'Test Child' },
+      global: { stubs: { ModalDialog: ModalDialogStub } },
+    })
+
+    expect(wrapper.findComponent(ModalDialogStub).props('title')).toBe('Confirm Task')
+  })
+
+  it('renders "Confirm Act" title for kindness acts', () => {
+    const task: Task = {
+      id: 'task-2',
+      name: 'Share Toys',
+      type: 'kindness',
+      points: 3,
+      image_id: '',
+    }
+    const wrapper = mount(TaskConfirmDialog, {
+      props: { task, childName: 'Test Child' },
+      global: { stubs: { ModalDialog: ModalDialogStub } },
+    })
+
+    expect(wrapper.findComponent(ModalDialogStub).props('title')).toBe('Confirm Act')
+  })
+})