On the phone
Still to write — what the app looks like in your hand, and what it is for.
A vault on your server and a fill provider on the phone. Logins and one-time codes go straight into other apps and into the browser — no copy-paste, no clipboard for another app to read. The TOTP secret sits beside the password it belongs to, so a second factor is one tap instead of a second device.
The whole path, in one take and on a real phone. Officer registers as an AutoFill provider in iOS Settings, alongside the ones already there. Then a login on a website gets filled from the vault, a passkey signs in without a password at all, and a BTCPay Server account takes both its password and its two-factor code — the TOTP arriving straight from the entry it belongs to, rather than from a second app on a second screen. Nothing is typed and nothing goes through the clipboard.
Every other protection you have runs through this one. Take someone's mailbox and you have their password resets; take the resets and you have everything else. A vault is therefore the actual key to the rest of a life — which is exactly why it should not be a subscription to a company that can be breached, acquired, or handed a warrant. Yours is a Vaultwarden on your own machine, reachable only across the mesh.
Still to write — what the app looks like in your hand, and what it is for.
Still to write — which sidecar backs it and what that process is responsible for.