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/ParentView.vue

@@ -31,6 +31,7 @@ import {
   maybeShow as tutorialMaybeShow,
   activeStep as tutorialActiveStep,
   modalTutorialStepId,
+  setHelpButtonHidden,
 } from '@/tutorial/controller'
 import '@/assets/styles.css'
 import type {
@@ -950,6 +951,10 @@ watch(showOverrideModal, async (newVal) => {
   }
 })
 
+watch(showConfirm, (newVal) => setHelpButtonHidden(newVal))
+watch(showRewardConfirm, (newVal) => setHelpButtonHidden(newVal))
+watch(showRoutineConfirmDialog, (newVal) => setHelpButtonHidden(newVal))
+
 async function saveOverride() {
   if (!isOverrideValid.value || !overrideEditTarget.value || !child.value) return