ios: digital password (instead of device auth) (#2169)

* ios: digital password (instead of device auth)

* set, ask, change password

* kind of working, sometimes

* ZSTack

* fix cancel

* update title

* fix password showing after settings dismissed

* disable button when 16 digits entered

* fixes

* layout on larger screens

* do not disable auth when switching to system if system auth failed, refactor

* fix enabling auth via the initial alert

* support landscape orientation

apps/ios/Shared/Views/UserSettings/DeveloperView.swift

@@ -38,6 +38,8 @@ struct DeveloperView: View {
                     settingsRow("chevron.left.forwardslash.chevron.right") {
                         Toggle("Show developer options", isOn: $developerTools)
                     }
+                } header: {
+                    Text("")
                 } footer: {
                     (developerTools ? Text("Show:") : Text("Hide:")) + Text(" ") + Text("Database IDs and Transport isolation option.")
                 }