fix: remove delete account button and direct users to support (#8515)

## Summary
Reverts PR #5216 delete account functionality. The delete button only
removed Firebase accounts without canceling Stripe subscriptions,
causing orphaned accounts and support issues.

## Changes
- Removed delete account button from UserPanel.vue
- Added text directing users to contact support@comfy.org for account
deletion (clickable mailto: link)
- Cleaned up related code: removed `handleDeleteAccount` from
useCurrentUser.ts, `deleteAccount` from useFirebaseAuthActions.ts,
`_deleteAccount` from firebaseAuthStore.ts
- Updated en/main.json locale with `contactSupport` key using {email}
placeholder

## Testing
- Typecheck and lint pass
- Manual verification: user settings panel shows contact support text
instead of delete button

## Related Issues
Fixes COM-14243

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8515-fix-remove-delete-account-button-and-direct-users-to-support-2fa6d73d3650819dbc83efb41c07a809)
by [Unito](https://www.unito.io)

Co-authored-by: Amp <amp@ampcode.com>

src/composables/auth/useCurrentUser.ts

@@ -1,9 +1,6 @@
 import { whenever } from '@vueuse/core'
 import { computed, watch } from 'vue'
 
-import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
-import { t } from '@/i18n'
-import { useDialogService } from '@/services/dialogService'
 import { useApiKeyAuthStore } from '@/stores/apiKeyAuthStore'
 import { useCommandStore } from '@/stores/commandStore'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
@@ -13,8 +10,6 @@ export const useCurrentUser = () => {
   const authStore = useFirebaseAuthStore()
   const commandStore = useCommandStore()
   const apiKeyStore = useApiKeyAuthStore()
-  const dialogService = useDialogService()
-  const { deleteAccount } = useFirebaseAuthActions()
 
   const firebaseUser = computed(() => authStore.currentUser)
   const isApiKeyLogin = computed(() => apiKeyStore.isAuthenticated)
@@ -116,18 +111,6 @@ export const useCurrentUser = () => {
     await commandStore.execute('Comfy.User.OpenSignInDialog')
   }
 
-  const handleDeleteAccount = async () => {
-    const confirmed = await dialogService.confirm({
-      title: t('auth.deleteAccount.confirmTitle'),
-      message: t('auth.deleteAccount.confirmMessage'),
-      type: 'delete'
-    })
-
-    if (confirmed) {
-      await deleteAccount()
-    }
-  }
-
   return {
     loading: authStore.loading,
     isLoggedIn,
@@ -141,7 +124,6 @@ export const useCurrentUser = () => {
     resolvedUserInfo,
     handleSignOut,
     handleSignIn,
-    handleDeleteAccount,
     onUserResolved,
     onTokenRefreshed,
     onUserLogout

src/composables/auth/useFirebaseAuthActions.ts

@@ -206,21 +206,6 @@ export const useFirebaseAuthActions = () => {
     [createReauthenticationRecovery<[string], void>()]
   )
 
-  const deleteAccount = wrapWithErrorHandlingAsync(
-    async () => {
-      await authStore.deleteAccount()
-      toastStore.add({
-        severity: 'success',
-        summary: t('auth.deleteAccount.success'),
-        detail: t('auth.deleteAccount.successDetail'),
-        life: 5000
-      })
-    },
-    reportError,
-    undefined,
-    [createReauthenticationRecovery<[], void>()]
-  )
-
   return {
     logout,
     sendPasswordReset,
@@ -232,7 +217,6 @@ export const useFirebaseAuthActions = () => {
     signInWithEmail,
     signUpWithEmail,
     updatePassword,
-    deleteAccount,
     accessError,
     reportError
   }