🐛 Bug Report: No Loading Indicator When Adding Payment Details on Cloud

### 👟 Reproduction steps

When saving a new payment method where the backend attempts to connect with Stripe for card verification, there's no loading indicator to show the app is processing the request. This issue persists from the moment the connection to Stripe starts until the card details are finally added to the database after verification.

Without clear feedback, a user might think the app has frozen or their action didn't register.

### 👍 Expected behavior

Show a small indicator beside the Save button.

### 👎 Actual Behavior

The modal on the screen looks like it is frozen a a few seconds.

### 🎲 Appwrite version

Appwrite Cloud

### 💻 Operating system

Linux

### 🧱 Your Environment

_No response_

### 👀 Have you spent some time to check if this issue has been raised before?

- [X] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [X] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)