Feature 2: Locked Notes in Saved Messages — After 🔒

I added a lightweight privacy layer for sensitive content stored inside Saved Messages.

Instead of creating a separate private chat or changing the whole Saved Messages structure, users can lock individual saved messages when needed.

How it works:

1. Long press a sensitive saved message
2. Tap "Lock" in the context menu
3. The message is moved to "Locked Notes"
4. Telegram shows a confirmation toast with an "Undo" action
5. Locked content disappears from the regular "Saved Messages" chat
6. To open Locked Notes, users must enter a separate passcode or use Face ID

This keeps Saved Messages fast and familiar, while giving users a safer place for passwords, backup codes, documents, addresses and other private notes.

Locked content stays hidden from regular previews and requires authentication before it can be viewed again🗣