fix: throttle sign-up and sign-in button (#7358)

## Summary

<!-- One sentence describing what changed and why. -->
Throttle signup button to prevent duplicate Firebase accounts

## Changes

- **What**: <!-- Core functionality added/modified -->
  - Add throttle to SignUp Button in SignUpForm component
  - Add throttle to SignIn Button in SignInForm component
  - Add loading state to SignUp Button in SignUpForm component

## Review Focus
related to this Notion page:
https://www.notion.so/comfy-org/Implement-Throttle-signup-button-to-prevent-duplicate-Firebase-accounts-2c46d73d36508193a8d1fb5146674956

<!-- Critical design decisions or edge cases that need attention -->

<!-- If this PR fixes an issue, uncomment and update the line below -->
<!-- Fixes #ISSUE_NUMBER -->

## Screenshots (if applicable)

<!-- Add screenshots or video recording to help explain your changes -->

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7358-fix-throttle-sign-up-and-sign-in-button-2c66d73d365081278f4dde0f34d60153)
by [Unito](https://www.unito.io)

src/components/dialog/content/signin/SignInForm.vue

@@ -60,7 +60,7 @@
     </div>
 
     <!-- Submit Button -->
-    <ProgressSpinner v-if="loading" class="h-8 w-8" />
+    <ProgressSpinner v-if="loading" class="mx-auto h-8 w-8" />
     <Button
       v-else
       type="submit"
@@ -74,6 +74,7 @@
 import type { FormSubmitEvent } from '@primevue/forms'
 import { Form } from '@primevue/forms'
 import { zodResolver } from '@primevue/forms/resolvers/zod'
+import { useThrottleFn } from '@vueuse/core'
 import Button from 'primevue/button'
 import InputText from 'primevue/inputtext'
 import Password from 'primevue/password'
@@ -100,11 +101,11 @@ const emit = defineEmits<{
 
 const emailInputId = 'comfy-org-sign-in-email'
 
-const onSubmit = (event: FormSubmitEvent) => {
+const onSubmit = useThrottleFn((event: FormSubmitEvent) => {
   if (event.valid) {
     emit('submit', event.values as SignInData)
   }
-}
+}, 1_500)
 
 const handleForgotPassword = async (
   email: string,

src/components/dialog/content/signin/SignUpForm.vue

@@ -28,7 +28,9 @@
     <PasswordFields />
 
     <!-- Submit Button -->
+    <ProgressSpinner v-if="loading" class="mx-auto h-8 w-8" />
     <Button
+      v-else
       type="submit"
       :label="t('auth.signup.signUpButton')"
       class="mt-4 h-10 font-medium"
@@ -40,24 +42,30 @@
 import type { FormSubmitEvent } from '@primevue/forms'
 import { Form, FormField } from '@primevue/forms'
 import { zodResolver } from '@primevue/forms/resolvers/zod'
+import { useThrottleFn } from '@vueuse/core'
 import Button from 'primevue/button'
 import InputText from 'primevue/inputtext'
+import ProgressSpinner from 'primevue/progressspinner'
+import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import { signUpSchema } from '@/schemas/signInSchema'
 import type { SignUpData } from '@/schemas/signInSchema'
+import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 
 import PasswordFields from './PasswordFields.vue'
 
 const { t } = useI18n()
+const authStore = useFirebaseAuthStore()
+const loading = computed(() => authStore.loading)
 
 const emit = defineEmits<{
   submit: [values: SignUpData]
 }>()
 
-const onSubmit = (event: FormSubmitEvent) => {
+const onSubmit = useThrottleFn((event: FormSubmitEvent) => {
   if (event.valid) {
     emit('submit', event.values as SignUpData)
   }
-}
+}, 1_500)
 </script>

src/platform/cloud/subscription/composables/useSubscription.ts

@@ -59,7 +59,7 @@ function useSubscriptionInternal() {
 
     const renewalDate = new Date(subscriptionStatus.value.renewal_date)
 
-    return renewalDate.toLocaleDateString(undefined, {
+    return renewalDate.toLocaleDateString('en-US', {
       month: 'short',
       day: 'numeric',
       year: 'numeric'
@@ -71,7 +71,7 @@ function useSubscriptionInternal() {
 
     const endDate = new Date(subscriptionStatus.value.end_date)
 
-    return endDate.toLocaleDateString(undefined, {
+    return endDate.toLocaleDateString('en-US', {
       month: 'short',
       day: 'numeric',
       year: 'numeric'