[fix] prevent duplicate verification emails on page refresh (#6167)

## Summary
- Fixed duplicate verification email issue where emails were sent every
time users returned to the root page
- Emails are now only sent automatically when coming from signup/login
flow
- Added proper toast notifications to cloud onboarding pages

## Changes
- **Conditional email sending**: Only send verification email when
`fromAuth=true` query parameter is present (from signup/login flow)
- **Auto-cleanup**: Remove `fromAuth` parameter after sending email to
prevent re-sending on page refresh
- **Toast system fix**: 
- Added `GlobalToast` component to `CloudLayoutView` for proper toast
display in onboarding pages
  - Migrated from PrimeVue `useToast()` to ComfyUI's `useToastStore()`
- **UI improvements**:
  - Better spacing and layout for email verification page
  - Added multiline support for tips and instructions
  - Improved toast messages with clearer titles and summaries

## Problem it solves
Previously, when users signed up and received a verification email,
every time they navigated back to the root page (`/`), the router guard
would redirect them to the email verification page which would
automatically send another email. This caused multiple emails to be
sent, often ending up in spam folders.

## Test plan
- [x] Sign up for a new account → Should receive ONE verification email
- [x] Navigate away and back to root → Should NOT receive another email
- [x] Click "Resend email" button → Should receive a new email
- [x] Refresh the verification page → Should NOT receive another email
- [x] Toast notifications appear correctly in all auth flows

[screen-capture
(1).webm](https://github.com/user-attachments/assets/25ffad94-d129-4051-b29e-5bdec696cd11)

src/platform/onboarding/cloud/CloudLoginView.vue

@@ -112,6 +112,7 @@ import { useRoute, useRouter } from 'vue-router'
 
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
 import CloudSignInForm from '@/platform/onboarding/cloud/components/CloudSignInForm.vue'
+import { useToastStore } from '@/platform/updates/common/toastStore'
 import type { SignInData } from '@/schemas/signInSchema'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 import { translateAuthError } from '@/utils/authErrorTranslation'
@@ -122,6 +123,7 @@ const route = useRoute()
 const authActions = useFirebaseAuthActions()
 const isSecureContext = window.isSecureContext
 const authError = ref('')
+const toastStore = useToastStore()
 
 const hasInviteCode = computed(() => !!route.query.inviteCode)
 
@@ -130,6 +132,11 @@ const navigateToSignup = () => {
 }
 
 const onSuccess = async () => {
+  toastStore.add({
+    severity: 'success',
+    summary: 'Login Completed',
+    life: 2000
+  })
   // Check if there's an invite code
   const inviteCode = route.query.inviteCode as string | undefined
   const { isEmailVerified } = useFirebaseAuthStore()

src/platform/onboarding/cloud/CloudSignupView.vue

@@ -102,7 +102,9 @@ import SignUpForm from '@/components/dialog/content/signin/SignUpForm.vue'
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
 import { isCloud } from '@/platform/distribution/types'
 import { useTelemetry } from '@/platform/telemetry'
+import { useToastStore } from '@/platform/updates/common/toastStore'
 import type { SignUpData } from '@/schemas/signInSchema'
+import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 import { translateAuthError } from '@/utils/authErrorTranslation'
 import { isInChina } from '@/utils/networkUtil'
 
@@ -113,14 +115,32 @@ const authActions = useFirebaseAuthActions()
 const isSecureContext = window.isSecureContext
 const authError = ref('')
 const userIsInChina = ref(false)
+const toastStore = useToastStore()
 
 const navigateToLogin = () => {
   void router.push({ name: 'cloud-login', query: route.query })
 }
 
 const onSuccess = async () => {
-  // The invite code will be handled after the user is logged in
-  await router.push({ path: '/', query: route.query })
+  toastStore.add({
+    severity: 'success',
+    summary: 'Sign up Completed',
+    life: 2000
+  })
+  // Check if email verification is needed
+  const { isEmailVerified } = useFirebaseAuthStore()
+  const inviteCode = route.query.inviteCode as string | undefined
+
+  if (!isEmailVerified) {
+    // Redirect to email verification with fromAuth flag
+    await router.push({
+      name: 'cloud-verify-email',
+      query: { inviteCode, fromAuth: 'true' }
+    })
+  } else {
+    // The invite code will be handled after the user is logged in
+    await router.push({ path: '/', query: route.query })
+  }
 }
 
 // Custom error handler for inline display

src/platform/onboarding/cloud/CloudVerifyEmailView.vue

@@ -16,17 +16,24 @@
     </h1>
 
     <!-- Body copy -->
-    <p class="text-foreground/80 mt-6 text-base">
+    <p class="text-foreground/80 mt-6 mb-0 text-base">
       {{ t('cloudVerifyEmail_sent') }}
     </p>
-    <p class="mt-3 text-base font-medium">{{ authStore.userEmail }}</p>
+    <p class="mt-2 text-base font-medium">{{ authStore.userEmail }}</p>
 
-    <p class="text-foreground/80 mt-6 text-base">
+    <p class="text-foreground/80 mt-6 text-base whitespace-pre-line">
       {{ t('cloudVerifyEmail_clickToContinue') }}
     </p>
 
-    <p class="text-foreground/80 mt-10 text-base">
+    <p class="text-foreground/80 mt-6 text-base whitespace-pre-line">
+      {{ t('cloudVerifyEmail_tip') }}
+    </p>
+
+    <p class="text-foreground/80 mt-6 mb-0 text-base">
       {{ t('cloudVerifyEmail_didntReceive') }}
+    </p>
+
+    <p class="text-foreground/80 mt-1 text-base">
       <span class="cursor-pointer text-blue-400 no-underline" @click="onSend">
         {{ t('cloudVerifyEmail_resend') }}</span
       >
@@ -51,6 +58,7 @@ const auth = useFirebaseAuth()!
 const router = useRouter()
 const route = useRoute()
 const { t } = useI18n()
+const toastStore = useToastStore()
 
 let intervalId: number | null = null
 let timeoutId: number | null = null
@@ -114,16 +122,17 @@ async function onSend() {
       useTelemetry()?.trackEmailVerification('requested')
     }
 
-    useToastStore().add({
-      severity: 'success',
-      summary: t('cloudVerifyEmail_toast_success', {
-        email: authStore.userEmail
-      })
+    toastStore.add({
+      severity: 'info',
+      summary: t('cloudVerifyEmail_toast_title'),
+      detail: t('cloudVerifyEmail_toast_summary'),
+      life: 2000
     })
   } catch (e) {
-    useToastStore().add({
+    toastStore.add({
       severity: 'error',
-      summary: t('cloudVerifyEmail_toast_failed')
+      summary: t('cloudVerifyEmail_toast_failed'),
+      life: 2000
     })
   }
 }
@@ -140,8 +149,18 @@ onMounted(async () => {
     return redirectToNextStep()
   }
 
-  // Send initial verification email
-  await onSend()
+  // Only send verification email automatically if coming from signup/login flow
+  // Check if 'fromAuth' query parameter is present
+  const fromAuth = route.query.fromAuth === 'true'
+  if (fromAuth) {
+    await onSend()
+    // Remove fromAuth query parameter after sending email to prevent re-sending on refresh
+    const { fromAuth: _, ...remainingQuery } = route.query
+    await router.replace({
+      name: route.name as string,
+      query: remainingQuery
+    })
+  }
 
   // Start polling to check email verification status
   intervalId = window.setInterval(async () => {

src/platform/onboarding/cloud/components/CloudLayoutView.vue

@@ -3,10 +3,14 @@
     <!-- This will render the nested route components -->
     <RouterView />
   </CloudTemplate>
+  <!-- Global Toast for displaying notifications -->
+  <GlobalToast />
 </template>
 
 <script setup lang="ts">
 import { RouterView } from 'vue-router'
 
+import GlobalToast from '@/components/toast/GlobalToast.vue'
+
 import CloudTemplate from './CloudTemplate.vue'
 </script>