feat(tutorial): implement comprehensive tutorial system with step guidance

- Added tutorial controller to manage tutorial state and progress.
- Introduced HelpButton component for contextual help throughout the application.
- Created various tutorial steps for onboarding and feature guidance.
- Integrated tutorial prompts in multiple components (ChildrenListView, LoginButton, ScheduleModal, etc.) to enhance user experience.
- Implemented logic to show tutorials based on user actions and state.
- Added functionality to dismiss and skip tutorial sessions.
- Established a mechanism to hydrate tutorial state from user profile.

frontend/src/components/shared/ScheduleModal.vue

@@ -161,10 +161,11 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import ModalDialog from './ModalDialog.vue'
 import TimePickerPopover from './TimePickerPopover.vue'
 import DateInputField from './DateInputField.vue'
+import { maybeShow as tutorialMaybeShow } from '@/tutorial/controller'
 import {
   setChoreSchedule,
   deleteChoreSchedule,
@@ -258,6 +259,13 @@ const intervalTime = ref<TimeValue>({
 const saving = ref(false)
 const errorMsg = ref<string | null>(null)
 
+onMounted(() => {
+  tutorialMaybeShow(
+    'create-chore-schedule',
+    () => document.querySelector('.day-chips .chip') as HTMLElement | null,
+  )
+})
+
 // ── original snapshot (for dirty detection) ──────────────────────────────────
 
 const origMode = props.schedule?.mode ?? 'days'