Nag UI when some of your own devices are not verified by you

[dbkr]

• If cross-signing labs flag enabled, whenever we have devices (in e2e, not the devices endpoint, ie. ignoring devices that don't support e2e at all) that are not marked as verified, show the nag bar new sign in toast.

Q: Does this also apply if the device itself is not verified? Or should that be a different thing?
A: This is the 'Skipped Verify' toast: https://www.figma.com/file/wwqBo5oAFfk8XKmtd2YaIs/Cross-signing?node-id=38%3A16

[jryans]

The current thinking now is that this will be the same "new sign-in" toast as #11218, but potentially saying "unverified" instead of "new" for devices aren't actually new.

[lampholder]

Is a toast right to represent this? It's not a real-time event, and you device will still be unverified if you dismiss the toast.

If we do want a toast:

• when does it appear
• when does it return if you dismiss it
• can you dismiss it 'permanently' (and how is permanently defined)

[jryans]

Let's ping @nadonomy for thoughts here. At the moment, the current implementation shows "new session" toats for both real time new sessions as well as all pre-existing unverified sessions, so existing users can be slapped by a large stack of toasts to work through.