UI improvements

[zaiatsartem]

Purpose

UI improvements

Changes

• Added social networks links (Telegram, X, Discord)
• Replaced system dialogs with new gradient style dialogs

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.