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/__tests__/ScheduleModal.spec.ts

@@ -146,6 +146,13 @@ describe('ScheduleModal Specific Days form', () => {
     expect(w.find('.default-deadline-row').exists()).toBe(true)
   })
 
+  it('exposes the enable-toggle row for the tutorial anchor', () => {
+    const w = mountModal()
+    const toggleRow = w.find('.schedule-toggle-row')
+    expect(toggleRow.exists()).toBe(true)
+    expect(toggleRow.attributes('data-tutorial')).toBe('schedule-enable-toggle')
+  })
+
   it('Save is disabled when no days selected (isDirty is false)', () => {
     const w = mountModal()
     const saveBtn = w.find('.btn-primary')