fix: Loading Stays Active When Clicking Outside Iframe Popup.

Description

When clicking outside the "iframe" (anywhere else on the page), the loading indicator remains visible over the "Install" button. However, when closing the iframe using the close (X) button, this issue does not occur.

Steps to Reproduce

1. Click on the three dots in the left pane.
2. Select "Marketplace".
3. Choose an app that:
   • Has not been installed OR
   • Has not been granted permission yet.
4. A popup with an iframe appears.
5. Click anywhere outside the iframe/popup.
6. Observe the loading indicator over the "Install" button.

Expected Behavior

• The loading indicator should not remain visible over the "Install" button when clicking outside the iframe.

Actual Behavior:

https://github.com/user-attachments/assets/c9004c61-6b87-4dba-8c08-964eeb0f1b8c

Server/Client Information:

Server:

• Operating System: Windows 11 (using WSL Terminal)
• Rocket.Chat Server Version: 7.5.0-develop
• Node.js Version: 22.13.1
• Yarn Version: 4.7.0

Client:

• Client Type: Browser (Microsoft Edge)
• Access URL: http://localhost:3000

Additional Information:

• WSL Terminal: Used for installing dependencies.

Are you working on this?

✅ Yes, I am working on this.

Reproduce the Marketplace app-install flow, open the iframe popup, and click outside it while observing the Install button. Trace the outside-click and popup-close handling, then verify that the loading indicator is cleared when the popup is dismissed outside the iframe.