Add FLAG_SECURE support #1209

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Add FLAG_SECURE to prevent screenshots and screen recording.

Why do you want this feature?

Since the application already supports password protection, it implies that users handle sensitive data. Therefore, it is logical and consistent to also support FLAG_SECURE to ensure complete privacy and prevent accidental data leakage via screenshots.

Additional information

Independence from Password Protection: The FLAG_SECURE option should be independent of the password protection feature. It should work even if the user does not set a password. Thank You, Comrades!