When importing a large host/template file, there is no visual feedback (loader, progress indicator, or disabled state) while the file is being processed. From a user's perspective, the import pop-up looks frozen and unresponsive, which is confusing and not user-friendly.

Not reproducible each time.

Steps to reproduce:

1. Go to Hosts/Templates.
2. Click Import.
3. Select a large import file.
4. Wait couple seconds when the file appears in the import pop-up. During this time try to click somewhere.

Result:

• No loader or progress indicator is displayed.
• The import pop-up remains visible but shows no activity.
• It looks like the pop-up is frozen or the application has stopped responding.

Expected:

• A loader, spinner, or progress indicator should be displayed while the file is being processed.
• The user should receive visual feedback that the system is working.