New Feature: Add "Security" tab to posts

[NfNitLoop]

Add a "Security" tab to posts that will list:

• Where to obtain the raw Protobuf data.
• Its userID and signature.
• A ✅ if the security check passes. (This is a bit redundant, since we currently ONLY display items for which the check has passed, but that might not always be the case. And it's nice to expose that functionality.)