feat: add parent PIN setup functionality and email notifications

- Implemented User model updates to include PIN and related fields.
- Created email sender utility for sending verification and reset emails.
- Developed ParentPinSetup component for setting up a parent PIN with verification code.
- Enhanced UserProfile and EntityEditForm components to support new features.
- Updated routing to include PIN setup and authentication checks.
- Added styles for new components and improved existing styles for consistency.
- Introduced loading states and error handling in various components.

frontend/vue-app/src/layout/ParentLayout.vue

@@ -14,6 +14,9 @@ const handleBack = () => {
   }
 }
 
+// Hide view-selector if on ParentPinSetup (PIN setup flow)
+const hideViewSelector = computed(() => route.name === 'ParentPinSetup')
+
 const showBack = computed(
   () =>
     !(
@@ -45,7 +48,7 @@ onMounted(async () => {
       <div class="back-btn-container">
         <button v-show="showBack" class="back-btn" @click="handleBack" tabindex="0">← Back</button>
       </div>
-      <nav class="view-selector">
+      <nav v-if="!hideViewSelector" class="view-selector">
         <button
           :class="{
             active: [