Massmailer confirmation popup

[miguelaenlle]

• Added functionality to show "Are you sure you want to send this notification?" alert before actually sending
• Clears fields when the user sends
• Tested this by replacing the request promises with setTimeout calls:

new Promise((resolve, reject) => {
   setTimeout(() => {
      resolve(true);
   }, 2000);
 });

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[Copilot]

Pull Request Overview

This PR adds confirmation functionality to the Massmailer feature, ensuring users confirm before sending notifications or emails. It also improves the user experience by clearing form fields after successful sends.

• Added confirmation popup using window.confirm() before sending notifications/emails
• Clear form fields and reset notification type after successful API calls
• Improved form state management with proper field resets

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[J164]

Tested, looks good!